The younger the cadet, the more willing he is to bend over and take it.
For example,
Pilot A has 200 hours, integrated course fresh out of training with somewhere near on 100k debt (after the type rating). He is 22, probably no children and more than likely not married or in a long term relationship.
Pilot B has 250 hours, modular trained having come from a different working back ground. Not quite as much training debt, and may already have a career he can earn £45k to fall back on. Now comes the crunch, this guy is 37, married with 3 kids who are at school.
Which one would you employ when you're looking for an extremely flexible pilot, one who will relocate to several bases and then float out of base for up to 30% of their working time?
FR do employ over 30-35's, just not many.