Boyz to Grandpas

"Grandpa, you're super old yeah?"
"Yeah, I'm a cinquenagarianist."
"Yeah, of the bookbook variety...but, besides your
gray hair, how do you know that you're old?"
"Well yesterday at work, some music from the ninety's came
on...I think it was some Boyz to Men...and this knucklehead
co-worker said, 'Allright! Some old school.'
I'm like thinking, 'What an idiot'....and then I started
thinking again and realized that I'm the idiot cuz that
song is like 15 years old and my co-worker is only 25."
"Boyz to Men?...prolly by now they're Boyz to Grandpas."