Claims of age discrimination is like claims that there is untapped cheap labor in hiring women in first world countries. If the claims were true anyone could hire up all of the cheap labor and stomp their discriminating competitors. That doesn't happen. Either it's really a grand conspiracy like some claim or the situation is not so simple. I think it's more likely older people expect to get paid more for their experience, are less likely to learn new things on their own like younger people are, are less likely to start up their own companies like younger people are because doing so is risky.

You see people obsessing over youth. They are not. They are valuing risk takers, people who know modern tech, people who don't expect to be paid so much just because they know more less useful to the current situation skills and knowledge. The quality of a low age itself is irrelevant. It will be the same 15 years from now. Current younger people will feel more entitled to higher pay, will feel less willing to compromise or settle for jobs which their younger peers would be happy to get. Ultimately if someone brings value to a job it's the stupidity of the employer to not understand their value. If a company can make 10x more from hiring someone why wouldn't they? Companies which don't hire the best value makers don't do as well, which allows those companies which do hire those people to float to the top. It is the same thing with women. Any sane businessperson would hire people no matter their gender if those people can make them more money, and anyone who is leaving value on the table by being discriminatory despite the lost potential leaves room for their competitors to destroy them. If you think older people can make you more money ultimately then you hire them and rule the tech world.