Exhibit D; Picard as a 70 year old Jack Bauer.
The scene of Picard beaming over to the damaged Schimitar to shut down the doomsday weapon was pure schlock. Why not beam a phaser into the damn reactor core and have done with it? Assuming that's too much of a bother, it doesn't say much about Starfleet's security corps if out of a crew of hundreds the most combat-capable crewmember is the 61 year old Captain of the ship!
Patrick Stewart is the star of the series and takes home the biggest paycheck. The audience goes to see him, not some twenty year old marine no one has ever heard of before. This is just the simple fact where a movie isn't going to match reality in this type of situation.
My explanation: A 70 year old in the 24th century is like a 40 year old in the 21st century. Advances in medicines in the future is quite an amazing thing.