1st off I don’t think you will find hardly any documented guys over 9” here.
I’m not that big, but I seem to be right at 8.5” these days.
Age is mostly the issue, I’m 45 and I notice a little drop off in performance, not much.
I’m a horney bastard though, my unit is hard before it comes out of my pants always, if we are about to go at it
In the last couple of years though I have noticed it gets harder later,(still while in my pants though ) and maybe only 80 % hard now while still in my pants.
As for trouble getting a bigger unit harder, who knows, I don’t think so though.
Pe has been great, I was with a girl last night and I have to say it looked frikken huge, she was working it with both hands.
What I noticed with pe and performance is two things
1st off the excercises make you stronger / stronger erections, I noticed this at the outset
2nd if you clam or wear a cock ring for a substantial amount of time prior to sex that can effect performance a little.