Here's a song for you.
Happy happy birthday,
You're almost twenty-one,
Your heart beats slower every year,
Until your time is done
I would say my goodbyes,
When your breath is coming last,
But now that you are twenty,
Death is coming fast
If you've made it through this song,
Without growing depressed,
Your a dying old bastard,
Go get shot in the chest
And no you're not old, I was simply exagerating to produce a comedic song based on your opinion that being 20 is old.