I read or heard somewhere that there there are two peaks ,guys in their twenties and then again guys in their 40s/50s.
The guys in their thirties are more likely to be occupied getting married,paying mortgages ,raising children.
Ten or twenty years later they may be separated,going through the 7 year itch or suffering from the "bollocks matrimonial problem".
When the women have finished pro-creating, the men can fuck off.
I started putting about 25 years ago after a break up. It was meant to be a shot term fix.. I don't do it as often now at 53.5 years, I prefer the massage with extras now...more of a real thrill than the wham bam thank you mam...the excitement of finding out what's available...more will she won't she and the gentle persuasion...more fun altogether for us at the mid life crisis stage!!!