I've had the same feeling as well, I have only seen a couple that give off the air of someone younger and those are typically the ones who complain over an update 'taking too long' or 'not having enough sex' or a game 'not having penetration' or 'not letting us fuck immediately.' I noticed the first most predominantly with projects that take a couple months or more between updates, the second and fourth with games like this, where it is a slow burn that ultimately doesn't lead to immediate sex, and the third with games that have a focus on a specific, non-penetrative fetish like "The Headmaster" or the couple of games that are specifically focused on exhibitionism without the MC getting fucked on sight. I don't mean any offense, but that immediately gives off an air of horny teenager that maybe isn't old enough to be here, though not all who meet the age requirement are at the equivalent maturity level.
I have never once gotten that impression. I though he might be older, especially with this much skill and talent in a field that takes time to hone, I was not expecting him to be my generation. It's actually kind of a relief because most of our generation that I have interacted with have a nasty case of entitlement issues or similar and most of the people of older generations I have interacted with do not have these issues. It led me to my mistaken impression.