In news from the “man, I feel old” files, Justin Bieber celebrates his 22nd birthday today and Twitter is reacting accordingly. #HappyBirthdayJustinBieber is trending worldwide and adorable throwback pictures of the singer are pouring in.

The love affair between the Canadian pop star and Twitter began all the way back in 2008, when a fresh-faced, floppy-haired Bieber was just 16 and starting out his career under the guidance of R&B crooner Usher with songs about puppy love.

He’s come a long way since then, accumulating various hits under his belt. And that’s not to mention the many run-ins with the law, a high-profile romance with Selena Gomez, and his very own reformed bad boy redemption story.

Some posted cute pictures from the star’s childhood:

And some chose to mark the occasion by reminding everyone just how much he’s, ahem, grown:

Others can’t quite believe he’s no longer that floppy-haired teen they first fell for:

Then there was this reminder of, shall we say, darker times?

All in all, there’s a lot of love in the air today: