Was going to mention that subreddit. A younger friend mentioned it to me. I've got... closing in on 30 years of software dev experience, and he's got... 4? 5? He's applying for 'senior' type positions, and I've tried to counsel him to set sites a bit lower. There are def some companies that will label you senior at 2-3 years of experience, but I don't think he'd do well at those sorts of companies anyway.

I was on a consulting team years back and everyone was 'senior developer' - I had 26 years, another guy had... 4 years. I always thought it was weird to be presenting us to a client as being on the same level, and one client mentioned it to me behind the scenes, but... wasn't my call.