Precisely, in Hollwood terms I'd say under 35 is still pretty young.
Another fact is that actors can often play characters 10 years younger than they are.
From what I call tell typically big studio's don't like handing big jobs to people until there about 30. Stallon, Alpachino, Brad Pitt, Hugh Jackman, and the list goes on all get there big starts around 30. By 35 they usually become big name stars or drop off the face of the earth.
All I can say is I'm glad I'm not expected to look good into my 40's, that kind of pressure gotta fucking suck.