Joe Jonas Good Genes or Good Docs?!

Joe Jonas' looks over the years will make you want "Cake By The Ocean!"

Here is a 19-year-old version of the Jo Bro rockin' out at the "Camp Rock" premiere with shaggy hair back in 2008 (left). Playing 'Shane Gray' alongside Demi Lovato was his breakout role ...

And, 17 years later, the singer and hot zaddy of two showed off his chiseled face with a shorter haircut and mustache at SiriusXM studios in NYC (right).

The "Sucker" singer celebrated his 36th birthday earlier this weekend, so with that being said, we mustache you one key question: Good Genes or Good Docs?!