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The big milestone birthdays come less and less the older you get. Being 10 is huge. Then comes 16, 18, 21, and 30.

After 30, it's pretty much decade after decade of, "You made it, here's a cake!" But being 21 is awesome and you truly are only 21 once.

It's legal to do a whole bunch of things! NO MORE HIGH SCHOOL! Sometimes more college and definitely more college debt, but hey, at least cheap beers happen. AND y'all don't need an ID to make you look younger.

Here are 10 21st birthday shirts for the lucky soul who's about to turn the best age anyone can be. (Except for the other ages that have cards...)

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1. Level 22 Activated

Source: OtziShirts.com

You made it, gamer. You totally crushed the opposition that was level 21. Now it's back to the beginning, for level 22. It's not as fun at the end of level 22, so you'd better make the most of it with this 21st birthday shirt.

Get the Level 21 Complete Shirt on OtziShirts.com

2. Princesses Age Too

Source: Amazon.com

On your 21st birthday and in this 21st birthday shirt, you earn the right to be adored. Sure, we all turn 21, but your time is now, and that's all we care about! It's just good to remind people sometimes...

Get the 21 Princess Shirt on Amazon.com

3. Light Up Your Cake

Source: Amazon.com

That's what being lit means, right? That you're gonna light your candles? Whatever it means, this funny 21st birthday shirt is pretty on point for the social media generation. We don't have to understand it to look cool because they do.

Get the It's My 21st Birthday and I'm Lit Shirt on Amazon.com

4. Happy Beerthday to You!

Source: Amazon.com

Beer is less fun now you can buy it. Be careful not to froth at the mouth at your own birthday celebration. Keep the froth on the top of the beer and your upper lip and the actual beer in your belly. You're legal now - yay!

Get the It's My Beer-thday Shirt on Amazon.com

5. A Simple 21st Birthday Shirt

 

Source: Amazon.com

The birthday girl or boy could be a classy, smart, and well-rounded individual. If they are, this shirt is perfect for them. It isn't overstated but also isn't understated. Does that make it simply "stated"?

Get the Twenty One Shirt on Amazon.com

6. Cheers and Beers!

Source: OtziShirts.com

More celebrations for the person who made it to 21. Make the most of the time around your birthday. Now you can buy the beers, you'll have to start buying rounds too. Literally the biggest downside to this whole "being an adult" thing...

Get the Cheers And Beers to 21 Years Shirt on OtziShirts.com

7. One Last Shot

Source: Amazon.com

Again, if you wear this 21st birthday shirt, nobody can say no. It's the law. If you wear it for more than a week after your birthday, people might clue into the fact you've been there a while. THAT SAID, you might as well try.

Get the Buy Me A Shot I'm 21 Shirt on Amazon.com

8. You Make 18 Look Good!

Source: Amazon.com

Another thing about turning 21, kids, is that you'll still have to carry ID around with you. If you don't, you may not be buying that alcohol after all! Being ID'd when you're of age is a blessing and a curse. Make the most of it.

Get the Damn I Make 21 Look Good Shirt on Amazon.com

9. Legally Drunk

Source: OtziShirts.com

How does it feel, dear 21-year-old? Is it any less fun to be drunk when you're legal? I mean, unless you puke, the answer to that last question will always be, "Heck no!" Just watch you don't spill any Schnapps on your 21st birthday shirt.

Get the 21 And Legally Drunk Shirt on OtziShirts.com

10. If You Insist

Source: Amazon.com

At oTZI, we're genuinely wondering how old we can be to wear this and get away with it. We also might try it just to see if we can get shots bought for us. I mean, that's the only time shots are fun.

Get the Twenty One and Hot, Buy Me A Shot Shirt on Amazon.com

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At a meager 21, you feel like you have your life ahead of you. And you do!
Even if it doesn't feel that way. I mean after you've drunk a lot of legally purchased alcohol while wearing one of these 21st birthday shirts.

You do have your life ahead of you.

So, dear child, be wise and be stylish.