I've experienced this and I'm only 36 (with no grey hair either). Got through a number of steps in interviews, technical is all fine etc, and then they went with another candidate.
I got a bit of feedback from a recruitment agent after he pursued one of the companies about this, seems they went with a younger candidate who was more desperate to work for them. Also the recruiter believed it was because they could pay them less.
Yes, coming in as a Jr Developer when you are older isn't easy especially at bootstrapped tech startups. The ability to pay lower wages to youngsters is also a barrier to entry.
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