It's possible my interview and other skills have declined, but after being rejected only once in the first 25 years of my career (when I was fresh out of school and terrible at interviewing), I've now been rejected from a half dozen jobs where I got to the panel interview. This included one where they said they planned to make an offer but ended up going with a different candidate. Another where it felt like a perfect match but then they never even got back to me. Another where I bombed a dynamic programming problem that leetcode puts at its most difficult rating. YMMV but I think it's tough out there.
Jobs are in short supply, applicants are numerous. Most interviews are also with managers 10 years younger than I am which may be a compounding factor. That's not an issue for me, but I think it's easier for them to hire someone of a similar age.
I guess its back to good ol' keyword stuff the resume again. jfc