You must be missing the point of the internet. I don't see a problem here; Only you made graduation year and age the proxy.

Why would the engineer reveal their HS graduation year if they didn't want the world to know it? I considered that they must have had little experience considering their graduation year and the average or even above average experience of those graduating the same year.

Based on the Google engineer's LinkedIn profile, it is obvious that using any gendered pronoun will be a touchy subject.