My anecdotal experience:

I'm ~40 with ~15 years of dev experience and 4 of management experience. I last year I decided to return to IC dev work and started applying for full-stack dev roles.

After two months and not getting few responses to applications, I put my resume in front of my tech recruiter friend:

"You sound ancient. Delete the first 10 years of your work history and take the date off your CS degree."

Whaaaat? I was incredulous at first, but eventually did as he said.

It would seem he was right though. I started getting significantly more responses to applications and inquiries from recruiters on LinkedIn.