I have had many conversations with MPA's over the years. It is not unusual for guys of any age to fire a blank. Lots of reasons for it.
Personally, the longer the time between having sex, the faster you can cum, to the point where it takes control ability to hold off long enough for your partner to reach orgasm.
I find that most SP's are useless, they have no buildup. MP's use the 10 minutes to stimulate you mind and body and entice you to where you already wanted to go. They use intuition rather than wam bam.