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

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.