Aerospace is ageist towards the older people? That's interesting, I'd think that experience would be the most important factor in that space.
The company will eat itself to death, but that will take years, and you'll have left to do the same to other companies, using your "success" at this one to prove you need an insane salary at the new one. Repeat, over and over.
Unfortunately a large part of their business model relies on fulfilling their commitment to seat engineers on programs as promised in the contract they signed with their customer, i.e., the USG. Filling seats is more important than achieving quality engineering outcomes. There are three big-time losers in that equation: [1] the taxpayer, [2] the "lifer" employee, and [3] the warfighter.
Also, the industry has a lot's of ups and down and far more recent grads than available positions.