David Hasselhoff Good Genes or Good Docs?

5/20/2011 2:50 PM PDT

David Hasselhoff: Good Genes or Good Docs?

"Baywatch" grandaddy David Hasselhoff can still rock those red trunks.

Here's the TV  lifeguard back in his '90s heyday (left) -- and the 58-year-old on the set of "Piranha 3DD" in North Carolina on Friday (right).

Someone's been laying off the cheeseburgers.