Browder can easily play 10 years younger than he actually is. In Stargate, I believe the actor that played Mitchell's Dad was actually younger than Browder.
IMDB says Ian Robinson, who played Frank Mitchell, was 2 1/2 years younger than Browder.
Still, I saw Browder at a convention last year (November 2011), and he was starting to look his age. I haven't seen his Chuck
or Doctor Who
episodes, though, so maybe that doesn't come off on screen.