100+ 21st Birthday Captions for Instagram, TikTok & Beyond (Funny, Short & Cute!)

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Looking for 21st birthday caption ideas that aren’t cringey?

When it comes to birthdays, the last thing you need is caption-related stress… so to help you out, we’ve assembled an epic list 21st birthday caption ideas that are perfect for Instagram, TikTok, or whatever other platform.

We hope you find the perfect 21st birthday caption you’re looking for!

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More Caption Ideas

Looking for more copy/paste captions? You’ll probably find what you’re looking for on these posts (via our sister site):

Short 21st Birthday Captions

Want to keep your captions short and sweet? Here are some fun 21st birthday captions that would be perfect.

21 – time to make some pour decisions.


(Legal) cheers to finally being 21!

It’s my 21st… I’ll wine if I want to.

Cheers and beers to 21 years.

So this is where aging ends, right? #Forever21

Who wants to see my ID?

Achievement unlocked: let’s drink! #21

Season 21, Episode 1.

And so begins Chapter 21.

Chapter 21, Page 1.

Here for cake, and cake only.

Woke up a little older… but not wiser.

My day, my way. #21

So this is 21.

Favorite day of the year. #21

Staying 21 until further notice.

Level up. #21

Lap 21 around the sun…

Birthday behavior! #21

I’m shawty and it’s my birthday. #21

Hey Siri, count the candles.

Just like wine, better with time. #21

POV: You can’t believe I’m 21 now.

On a scale of 1-10, feeling a solid 21.

Est. [Birth Year]

Wow, never been 21 before.

Hello, 21.

Keeping it real since [Birth Year].


Experience level: 21.

Achievement unlocked: 21.

Be good to me, 21.

Cheers to another lap around the sun. Hello, 21.

Well look who just turned 21… 

Another year, another candle on the cake. #21

Say hello to the world’s latest 21 year old.

Funny 21st Birthday Captions

Birthday captions don’t need to be cheesy or serious. Sometimes, the best captions are a little lighthearted and fun. Here are some 21st birthday captions that have a humorous twist.

Twinkle twinkle little star, take me to the nearest bar.

Been pre-gaming 20 years for this moment.

Shoutout to my mama who was in labor 21 years ago.

Be careful what you wish for… My parents wished for me 21 years ago and look where that ended up.

21? Who cares. I just want cake.

Officially 21, but still mentally about five.

21 years later and I’m still a hot mess. 

Made it to 21! I know. I’m as surprised as you are.

Agent of chaos for 21 years.

Tripping on my own feet for 21 years. Here’s to many more years of clumsiness.

Got so distracted by cake, I forgot it was my own birthday. #SoThisIs21

Another year older, but I’ll need some extra time for that ‘wiser’ bit. #21

I don’t care how old I’m turning, so long as there’s cake.

21st Birthday Captions for Selfies

Birthdays are the perfect day to post a shameless selfie. Looking for fun 21st birthday captions to go with your selfies? Here are some fun options.

Always been a savage, now I’m 21.

Card me, I dare you.

21. Serving cake, and serving looks.

Getting badder with age. #21

Baddie since [insert birth year].

You really gonna scroll without wishing me a happy 21st birthday?

Only took 21 years to get this cute.

Another year, another selfie. #21

Celebrating another level up. #21

Make a wish. #21

Wishing for you this year 😉 #21

Bday wish for the bday bish? #21

Time to see what 21 is all about.

Est. [Month]/[Day]/[Year]

21? Bring it on.

Birthday mode: the youngest I’ll ever be, and the oldest I’ve ever been. #21

Growing and glowing. #21

Aging and raging. #21

Waited 662,256,000 for this.

That birthday glow. #Feeling21

I think 21 looks good on me.

21st Birthday Captions for Photos with Friends

In need of some 21st birthday captions to pair with photos you’ve taken with friends? Whether you want to comemmorate that special bday party or dinner, here are some fun caption ideas for turning 21 with friends.

Wouldn’t want to turn 21 with anyone else by my side.

Ringing in 21 with the best crew.

Wouldn’t have made it to 21 without these beauties. Here’s to another lap around the sun!

21 is looking pretty good with this crew by my side.

Cheers to good friends, good vibes, and another 21 years.

Feeling unstoppable at 21 with this crew by my side.

Grateful to have found my people by Age 21.

Another lap around the sun with the best people I could have ever asked for. Here’s to 21!

Can’t wait to see what 21 will bring with these beauties by my side.

Birthday wish? Already come true with this crew on my side. #21

21: Wild and free.

Can’t wait to tell our kids one day about how awesome and hot we were at 21.

Only 21, but forever the mom of the group.

Age 21 but forever the baby of the group.

Thankful to be ringing in 21with the best people I know.

Turning 21 with the best friends anyone could ask for. #grateful

Age is just a number, but friends like these are forever. Thank you all for helping me ring in 21.

Don’t wanna be sappy so… let’s just say 21 is already one for the books.

Excited for Chapter 21 with this crew on my side.

Start of Season 21 with the best co-stars I could have ever asked for.

Chapter 21. Time to make some memories.

Making memories with this crew… 21 is already off to the best start I could have ever asked for.

These beauties are the only gift I need. #21

21 will be a breeze with friends like these on my side.

21st Birthday Captions for Photos with Family

Birthdays are a great time to pay homage to family, so whether you’re posting a cute throwback photo or a photo of a family celebration, here are some fun 21st Birthday captions.

Thanks for letting me bother you for the past 21 years.

21 years of being your favorite pain in the butt. Here’s to 21 more.

Thankful to be ringing in 21  with the best family I could have ever asked for.

Lucked out with a fam like this. Thanks for helping me ring in 21!

Turning 21 with the best support system in the world. Thanks for making the past 21 years so unforgettable!

Family is everything. Cheers to another lap around the sun! #21

Couldn’t have made it to 21 without you. Family truly is the best gift <3

Celebrating 21 with some unconditional family love. Now, can I get some cake?

21st Birthday Quotes/References from Pop Culture

We here at Thoughtful Gift Club love a good quote and reference. Here are some perfect quotes and references from movies, TV shows, and songs that would make for perfect 21st birthday captions.

“I’ll have a pina colada. Not virgin. Wanna see my ID? Totally have it.”

“It sucks to be under 21.” Good thing I’m not!

“Every day my birthday, bitch, it’s lit, I just turned 21”

“When I was only seventeen, couldn’t wait for twenty one”

“We only got one year to be twenty one, twenty one, twenty one. One more baby, have some fun”

“Everybody wants to be twenty-one, Full of life and life full of fun”

“O.K., you know that what happens at the 21st B-Day, stays at the 21st B-Day”

“21 21 21 21 I feel like 21”

“Wouldn’t trade it for the world, I’m 21 now”

“It’s no time to be 21”

21st Birthday Captions for Others 

Last but not least, are you wishing someone else a happy 21st birthday? Here are some more 21st birthday caption ideas that will work for friends & family alike.

21 and you’ve never looked better. Here’s to you!

Say hello to my new favorite 21 year old.

21 has never looked this good. Happy birthday, [Name]!

Helping this one ring in 21. Cheers to another lap around the sun!

Some things really do get better with age… like [Name]. Happy 21st birthday!

Can’t believe you’re 21. Here’s to another year of amazing memories.

Who knew 21 could look this good? Aging looks good on you.

Did We Miss Any of your Favorite 21st Birthday Captions?

Let us know in the comments so we can add more to our list!

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