Ryan Phillippe -- Skin to Win for Fitness (PHOTO)

A shirtless Ryan Phillippe jogging over the weekend in his Beverly Hills neighborhood could be proof the fountain of youth does in fact exist.

Phillippe -- and his 6-pack abs -- don't look like they've aged a bit since his "Cruel Intentions" and "54" days.

This is 40, folks. For Ryan.

**Warning: Actual results may will vary if you try this at home**