I stopped wearing them years ago and I'm 25. Just didn't see the point. I have a fleece jacket that does a better job, just use it.
My wife bought me my first hoodie at 31. I only really wear it at home. Even if I wore it outside the hood seems a bit pointless as it is so easily blown off or saturated with water (I would guess).
Doesn't it have strings to tighten the hood?