I recently reconnected with a former college boyfriend of mine. We dated when we were both 18-19 and now we are early 30s. We hooked up and I feel kind of dumb because I remember his dick being larger.... I had a good time and am not trying to pass judgement, I'm just not sure whether I don't know anything about penis biology or if my memory is just bad.

So, does penis size shrink over time (maybe like height?) or is it just my perception/bad memory? Or could some environmental factor cause it to have gotten smaller? To be fair I had basically nothing to compare him with when we were in college so maybe he was always below average, or maybe my memory has an enlarging effect. He's also gained a bit of weight (just what you'd expect for someone who doesn't have a teenage metabolism anymore) so maybe that could be the cause?

Penis-havers please help me, this experience has me genuinely curious. Google seems to say penis size can shrink with age but the reasons listed seem to be something that would be happening later in life (40s-50s) so I want some reddit anec-data.