I have to ask this question.
What, exactly do you consider "experience"?
Once you have landed in -30C or +50C or max crosswind or at altitude 10 times, what else are you gaining?
The law of diminishing returns is inevitable, and the simple fact is that airline flying is a very very thin script. Very rarely does anything happen off script. So rarely that you might never see it in a career. There is a lot of book learning to be done about what-ifs, but that requires an eidetic memory, not experience.
Handling skills, however, are rarely better than when a cadet has just finished training.....
If you have ever flown anything requiring a bit of skill and capacity, you might realise, as I have, that whilst I am more experienced than my youthful self, I am certainly no longer the better pilot.
There is a reason that militarys don't use old pilots, and it isn't because they can't afford them.