Lot of threads asking this or similar question. Really?? I've never measured a cock. But I can always tell if he knows how to use one. Experience is everything. In general older guys are more experienced, confident, aren't embarrassed about what they like, more assertive, and know how to please themselves and their partner, no matter their cock size.
Except for the cock part, this can be said of older and more experienced women as well. Not afraid to help out, knows exactly what to do, knows he's going to be happy and expects happiness for herself during the fun. I have a newer friend of mine who told me recently that she stopped "making love" a long time ago. Now, she has sex and has never been happier.
I honestly think it is mainly attention to detail in a partner that I am with. Open communication as well, If it looks like I'm about to get with someone I ask and pay attention to physical and verbal signs they are enjoying themselves. If I start doing X half a minute or so I will ask if they like what I am doing and I listen and pay attention to what they say. I think middle age has made me more confident and less unsure of myself as well. I'm no pornstar in the package I was blessed with just like average 5.5" or so (haven't measured since high school but in comparison to then I lost a bit probably from smoking cigarettes I was around like 6.25" back then). But whether it be a straight woman, a Trans female, or guy I have heard unless said individual is a size queen per say I normally have heard that how you are as a partner is more important than the package per say. I have heard surprisingly often from individuals that people blessed with good or better endowment can often believe that the size can make them a more lazy lover attentively. I know their are exceptions ideally if it was a perfect world. IF I was with someone I would probably prefer purely on size would enjoy a 7-7.5" cock or strap on if penetration was on the menu for me that day. But I do believe size isn't the be all end all for performance. Just my 2 cents from a pansexual man's point of view. If you're not too narrow and have at least 4.5-5.5" and know how to use it position and leverage or angle wise you can please me and not be well endowed if it is a penetration perspective.
An average size, between 4.5 and 6.5" long and average thickness. Not sure what thickness that is but thicker is better than longer. I know my hubby's 6" and 5" around fits perfectly.