Weezer Singer Rivers Cuomo -- Good Genes or Good Docs?

Rivers Cuomo's iconic geek-chic look is still rockin'!

Here's a 30-year-old version of the Weezer frontman on stage at Coachella back in 2001 (left) and 18 years later ... the 48-year-old Buddy Holly look-alike on stage during weekend 1 of Coachella 2019 in his iconic black framed glasses (right).

Say it ain't soooo!

The question is ...