This Is About As Shocking As The News That Bears Shit In The Woods.
The IT industry in general and the USA large IT corporates in particular, are ageist by design. That's not to say they don't discriminate in other ways, but the cult of youth is very strongly embedded and structures and practices are in place to support it. Having lived and worked through the change, it's not been good or pleasant. When I started it was common for technical colleagues to have been working for more than forty years at the firm (or it's predecessors). When I was last working for a USA corporate, the average tenure amongst the doers was five years. If you didn't shuffle up the greasy pole and slide over to the dark side in management, the large growing target on your back was plain for all to see. And don't get me started on the incredible shrinking number of women and the obsession with reinventing the wheel.
I'll get my coat, it will be the one with specifications, designs and testing plans in the pockets...