Supply and demand, rb.
There are only a small number of openings for fresh CPLs in ME Airlines (mainly things ike QRs second officer scheme) and a HUGE number of potential candidates. These schemes take a lot of investment from the airline, a fresh CPL is under training for a lot longer than a Jet experienced SFO new-joiner, so of course they want to maximize their investment.
Get some jet hours, and suddenly age is less of a factir. Plenty of guys in their 40s and even 50s being employed if they have the requisite experience.
Like the L-1011 debate you started, you have to face reality!!