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The BlueCotton Blog

20 Killer Birthday T-Shirt Ideas For Your Friends

Posted on September 2, 2018April 18, 2025 by MCC

Good food. Good drinks. Good people. Is there anything better than a birthday celebration?

I know you’ve probably got at least a few friends who are going to be marking the occasion in the near future. This year, why not take things a step further with some custom clothing? I’ve collected a few of my favorites below – see if you can find anything that gives you a spark of inspiration, then hop into BlueCotton’s Design Studio to get started on a custom piece of your own. Get everyone on board to wear matching custom t-shirts that help you celebrate your best friend together with a thoughtful surprise.

  1. My Age in Dog Years

It gets funnier the older you get – I think. Maybe. Whoever you get this for, be sure they’ve got your dark sense of humor.

  1. Know-It-All Millennial

Turning 30 is a pretty big milestone, and a pretty weird age. Everyone younger than you thinks you’re an adult, and everyone older looks down on you as a kid. This shirt taps into that irony.

  1. I Don’t See the Problem

You and me both, friend. You and me both. As the years wear on, you just gotta keep those glasses coming.

  1. Multiple Choice

I mean, obviously, the correct one is option D. Most of the time, anyway. Customize it by adding their age, from their 21st to 100th.

  1. Straight to the Point

I like to think that the older you get, the more direct you become. After all, at a certain age, you don’t have a whole lot of time left to mince words.

  1. The Sad Truth

This entry is probably the most relatable on the list – if only because it’s way too true. We all feel young at heart, wondering who this grown-up in the mirror is.

  1. An Invitation

Let it never be said that people lose their sense of fun and adventure when they age. For your cheeky friend celebrating their 50th birthday, this is sure to get a laugh.

  1. Speaking From Experience

Hey, young people tend to be idealistic and naive. The older you get, the more you realize their foolishness, right?

  1. The Big 4-0

I’d say that’s an accurate representation of how most people feel on their 40th birthday. For the sarcastic math nerd or your just plain snarky friend, this custom tee is on point.

  1. Adding Up the Numbers

Personally, I think it’s pretty awesome if you make it to 50 without losing your sense of childhood wonder.

  1. Aging “Gracefully”

Some people like to say they age like a fine wine. This shirt’s a little more realistic. Plus, wine eventually turns to vinegar when it gets old enough – so that should say enough.

  1. Magnificence

That’s certainly one way to look at it (the only way, some might argue). Who needs to be modest when you’ve got age-old brilliance?

  1. Sterling Silver

Hey, some people find that charming. Enjoy going gray with all your friends or give a funny shirt to your parent’s social circle.

  1. And Have a Drink or Four While You’re at It

This tee is yet another riff on the classing saying – and one that moves away from the old age card a bit. I think we’ve explored that avenue enough for one piece, wouldn’t you agree?

  1. Recognizing Royalty

A great choice for the friend who thinks they’re all that and a bag of chips. Provided you agree with them, of course. Though I suppose you could purchase this one ironically, too.

  1. An Excellent Idea

Not a whole lot else to say here, just another twist on this timeless quote. There are few better excuses to get roaring drunk than someone’s birthday, after all!

  1. Getting Close to the Endgame

I mean, you don’t necessarily have to buy this one for someone’s 40th. You can easily get it for any gamer in your life and customize it for their birthday year.

  1. The Best Things Take Time

At least, that’s what we say to take the edge off of aging. Make sure your friends get a chuckle on their 30th with this funny birthday present.

  1. Patch Day

Got a programmer or tech geek whose birthday is coming up? They’ll probably get a kick out of this one, whatever age they’re turning.

  1. At Long Last

21 is a pretty big banner year for most people. Why not celebrate their 21st in style with a shirt that shows everyone where your mind’s at?

Birthdays are pretty important occasions. Next time a friend of yours celebrates one, whether it’s a milestone or they’re just another year older, bring them some custom clothing. It’ll make the occasion a whole lot more memorable, I’m certain.

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