"Should be" and "are" are two entirely different things. I should be a fine young man now, but I'm not. Whatever I should be at 40, I'm guessing I'll come up a little shy.
Like... I should be in bed right now. Should be. But am I? Not so much. And the reason for that, of course, is because I put off sleeping every night, as it only means I have to go back to work faster.
Getting older is crap. For me, the years just move faster and faster. In the time it took me to hit 15 from 10, I could fit four dozen's worth of the time it took me to hit 25 from 20. It's bullshit.