Amy Poehler -- Good Genes or Good Docs?

Amy Poehler's good looks are truly worthy of the big screen!

Here's a 30-year-old version of the former "Saturday Night Live" cast member at a party in New York City back in 2001 (left) and 17 years later ... The "Mean Girls" actress -- who's celebrating her 47th birthday this weekend -- was looking like a cool mom in Beverly Hills last month (right).

Lookin' grool!

The question is ...