I'm 27 and Steve McQueen is very high on my list of all-time total badass awesome people. But you are right, you never hear about old actors like that unless you go looking for them.
Bullitt was one of the first movies I saw that really got me interested not only in Mopars with that awesome Charger but also '60s culture and older classic movies in general. Just the way the acting, cinematography, writing etc. is so different from movies made today I thought it was really interesting. About 10 years ago I got a 2-disc DVD set of Bullitt with a whole bunch of extra features and commentary including 'back-in-the-day' interviews and behind-the-scenes stuff from my local Best Buy.