21st birthday captions.

A New, Adult Me : 21st Birthday Captions

Birthdays are milestones that are worth every bit of celebration. Finding the best words to express your joy on yourself or for your beloved special people during those special occasions is not an easy task. It is even a more significant challenge when the message you are putting across is celebrating the 21st birthday. Such is a person who has lived two full decades and has started the third one. That is indeed a special milestone. You need an exceptional message to wish that special someone a happy birthday.

You are worried, “How do I carefully choose beautiful words that I can use to deliver my message?” Worry no more! We have made a collection of excellent Instagram captions that you can use alongside that unique photo to pass beautiful birthday messages. You will find our suggestions very useful as you craft your particular messages for your loved ones on your Instagram.

Table of Contents

21st Birthday Caption for Yourself on Instagram

Here are captions to wish yourself a happy 21st birthday since you are the most important person who loves you.

  • I wish myself a happy 21st birthday since I am the definition of awesomeness. Self-love!
  • Twenty-one years ago, my mother received a special gift, a bundle of joy in the form of me. I wish myself many more happy years ahead. Thank you, Mom!
  • When I was four years old, I used to believe broadcasters lived inside radio and TV sets. Now I am 21, and all the innocence is gone. I look forward to facing the challenges of adulthood cheerfully. Happy birthday to me!
  • I’ve waited for this day for 21 years. Now that it’s here, I’m going to spread my wings and fly.
  • Tossing the fake ID today. YEET
  • No more flashing my ID. Starting today, I’m showing it in slo-mo.
  • Turning 21 today. Accepting Lyft and Uber donations.
  • Best. Birthday. Ever!
  • Crying tears of joy. 21 feels good.
  • I have a devilish smile on my face because I’m 21 today.
  • It’s my 21st. Let the partying begin!
  • Just turned 21. ID in hand. Let’s Go!
  • Warning: It’s my 21st birthday.
  • Amazing things happen to people born on this day. Happy B-Day to me!
  • It’s my special day, so I’m filling your timeline with pics of me today. You’re welcome.
  • Still young and fun at age 21. Happy Birthday to me.
  • Just made 21, so pardon me while I take this ego trip.
  • Can’t nobody tell me nothin’ …I’m 21 today.
  • Forever 21!
  • My 21st birthday is non-negotiable. I will do what I want, when I want, and how I want.
  • It’s my birthday. Time to secure this bag.
  • Unapologetic-ally 21 and having fun on my special day.
  • Cake $200. Candles $20. Balloons $50. Age 21, priceless. There’s something money can’t buy, for everything else…there’s this outfit.
  • This is my year to thrive. Happy 21st B-Day to me.
  • Twenty-one years old and counting. I thank the Almighty God for this far. The 20 years I have lived so far have taught me that aging is a process, and I will never take my youthful years for granted. As every single day passes, we are aging slowly. I am so happy to achieve this milestone. It is transformational.
  • Happy 21st birthday to me! May I live long to witness my very bald head and the changes in my facial appearances over the faces of time.

Funny 21st Birthday Instagram Captions

Twenty-one is the age of legal and moral freedom and realization of responsibilities.

  • You are 21, one-fifth of a century, plus one, four more to go. May you live long to be toothless.
  • Welcome to the age of responsibilities and, hold your horses; you’d wish to go back to 16. It is a long journey with your shoulders heavy.
  • You just started your first year of the third decade. Phew! It has been a minute.
  • It is impressive how much adults can learn in just six years. When we were 15, they looked and sounded too dumb. Happy 21st birthday!
  • On your 21st birthday, you can make life-changing decisions like drinking and partying all night. We look forward to the introduction of new life in nine months.

21st Birthday Instagram Captions for Guys

The boy-child will appreciate a cute caption and appreciation through your IG with captions like these.

  • 21 is the age when you realize that you can still be mama’s boy even after leaving mama’s house and paying your bills. Happy birthday to all guys turning 21 today!
  • I am happy for you on your 21st birthday, my small brother. Another lion from the pride comes of age. I feel so proud of you. Happy 21st birthday, brother!
  • 21 and oh so fun! The life of a man begins at 21. I am happy for our friendship, and I am now sure the little boy who used to protect me from bullies is now a man who can defend his fairer friend from the cruel world. Happy birthday my friend! Being a girl and your lifetime friend has always given me happiness and a sense of security.
  • As you turn 21, I send you my best wishes, an angry young man! Though you used to get angry quickly while growing up as a boy, I am glad your anger was because you wanted to ensure everyone did the right thing. May you become an “angry” man whose “anger” will change the world by upholding justice and standing for what is right.
  • Welcome to the men’s club, brother. Boyhood was a sweet drink, but manhood has vinegar. However, you know what? May you learn to sweeten it with your efforts, we all did. I wish you all the best!

21st Birthday Captions on Instagram for Your Best Friend

Appreciate those people who can never stab you from your back- the rare true and best friends with some of these warm captions.

  • A friend for one day is just that, friend. A friend for over seven years and counting is family. Join me in sending the warmest of wishes to my best friend as she turns 21. Enjoy your special day, my friend, for keeps!
  • I am so happy for this day, 21 years ago, and my best friend, “partner in crime,” my brother from another mother was born. May you be happy now and many more years of success and friendship to come!
  • Have fun, friend. 21 is just the beginning. Cheers, to the rest of your years ahead. It will be so much fun to have you as my friend. You make my life beautiful.
  • It is your birthday friend, what gift do you plan to give me on this special day? Never mind, I am just kidding. I have your extraordinary gift only fit for a friend who is family.
  • The world has so many other things that should make us worried. A little party will not be so much to ask of us, friend, as we usher you into your 21st year of birth! Happy birthday! May you always wear that inspiring smile!

Funny and Sweet 21st Birthday Instagram Captions for Your Boyfriend

Here are some tips for IG captions that would make your man feel special.

  • A beautiful night for a wonderful boyfriend! I wish you a happy 21st birthday, sweetheart.
  • Help me to wish the most awesome boyfriend in the world a beautiful and happiest event as we celebrate his 21st year of birth.
  • On this particular day, as you turn 21, I offer you the best birthday present, my love for you, which is immeasurable. I am the luckiest girlfriend today.
  • Being this guy’s girlfriend is great. It is, however, costly on his birthday since his cravings are unique. I wish you a happy one on your 21st birthday, my love.
  • How wonderful! The biggest thief in the world, the man who has stolen my heart, turns 21 today! Join me in giving him the warmest wishes today.

Funny and Sweet 21st Birthday Captions for Your Girlfriend on Instagram

Here is for the guys who wish to craft sweet and humorous messages for their girlfriends on IG; you can draw some inspiration from them.

  • Here is to the girl who makes my heartbeat stop for a moment, the only round of ammunition in my revolver; the only dream that has ever come true, my girl. I wish you the best as you turn 21. I am so proud of you, my lady!
  • On your 21st birthday, I celebrate the most beautiful girlfriend in the world. There is something exceptional with this day since God carefully created the love of my life; it appears he carefully arranged in place each of your parts. That is why you are gorgeous. I wish you the best on this occasion and many more to come. I would still want to be at your side as you celebrate your 99th.
  • Happy birthday to the one who illuminates my world from dawn to dusk, the woman who gives me butterflies of excitement in my heart. I wish I could attach my heart to this birthday wish as you turn 21. It is a beautiful feeling for me here, and I am sure it is even more enjoyable for you.
  • My sweet girlfriend is now 21; you are more delicious than your sweet-16 version. The older you become, the more I fall in love with you. I wish to grow to the toothless age with you so that I can be laughing at you with my toothless gum.
  • May my wonderful girlfriend enjoy her 21st birthday today! We celebrate the many more years of your hugs, kisses, and happiness that will come. May I never be an onion in your life because I never want to see you cry; may I be like the laughing gas in your life because I only want to see you happy. I wish you all the best, my love.

21st Birthday Captions on Images

Caption you can use for your 21st birthday.
Warning: It’s my 21st birthday.
Caption you can use for your 21st birthday.
Just make 21, so pardon me while I take this ego trip.
Caption you can use for your 21st birthday.
Still young and fun at age 21. Happy birthday to me.
Caption you can use for your 21st birthday.
Unapologetic-ally 21 and having fun on my special day.
Caption you can use for your 21st birthday.
It’s my 21st. Let the partying begin!
Caption you can use for your 21st birthday.
This is my year to thrive. Happy 21st b-day to me.
Caption you can use for your 21st birthday.
Forever 21!
Best Birthday Messages

Related: 200 of the Best Birthday Messages to Make Someone’s Day Special

You may also like:

Birthday Wishes for 21st Birthday | Surfing Your 20’s

#MySpecialDay | 199 Birthday Instagram Captions

10 Milestone Birthdays and 20 Wishes for those Special Birthday Celebrations

author avatar
Elias Malassidis

Elias's tendency to storytelling could have been a hereditary thing, but his love for everything urban, for all things modern, and for the answer to the question 'why' all led him to his personal quest for self-fulfillment.

He has been a leading member of the team behind Birthday Wishes Expert, and has served as the chief editor on the website.

He is an avid traveller, a film director, and a recording artist under the moniker El Buho.

(Website | Spotify | Apple Music )