Supply and demand. When the airlines are in desperate need of drivers (as seems to be the case at present), they'll take whoever they can get - within reason of course. When airlines don't need drivers, well it really won't make too much difference what your age and experience levels are.
FYI, obtained my CPL at age 27, and landed my first gig with a major airline after 11 years in G.A. But then I had the misfortune of entering the industry at a time when supply definitely exceeded demand. Timing is everything...