I'm much younger than you, but I also interviewed with Google last year, got rejected after on-site, apparently a "close call" too. Did you grind leetcode enough? ;)
For example, "it was a close call" could mean:
- you were late to the interview, and we didn't like that
- we closed the job and stopped recruiting everyone
- you had mustard on your shirt, and we didn't like that
- an interviewer was late to an interview, insisted you proceeds anyway, and you could not possibly have received a vote of confidence for the questions asked in the time allotted
And so on and so on. The only things you can really trust are got hired, didn't get hired, and never heard back. That's it.
And apparently at Google - the negatives carry the day.
That's what I was getting at - apparently it's negativity-driven, all the way down.
The signal was what I was told when I got a subsequent unsolicited contact from a Google recruiter. She communicated this information to me verbally. (I believed her, and in retrospect still do. She was great during the whole process; never gave me the slightest indication that she was in any way deceptive or dishonest.)