There are a lot of younger people here on the fediverse. Some advice: no matter what anyone says, your 20s are, without a doubt, a time when your age starts with 2.
Now I'm in my late 30s and have some distance on my 20s. I can tell you that your age starting with 3 is something you're going to have to wait to experience until your 30s, with the obvious exception of when you were 3.
My older friends and loved ones assure me that my 40s are going to be a time of a 4 in the tens digit of my age.
@darius i wish i had known this when i was 3!