Sorry to hear of your 'disfunction' issue, Twister.
So happens I had a similar experience yesterday with one of Scotland's top WGs. All came good in the end; well, in her mouth, actually. But it wasn't her age that was the trouble as she is respectably thirty something. It was her very gorgeousness that troubled me, I think.
Ah well, horses for courses.
My third ever punt, at the age of 61, was with a (genuinely) 19 year old student from Edinburgh Uni.pretty on 'girl next door' kind of way. Kept going back and the whole thing developed into a sugar daddy/babe thing. Totally amazing sex while it lasted; and it lasted till she graduated with honours. We both enjoyed, not only the sex, but each other's company.
History, now.
The thing to remember, Twister, is that your issue is all in the mind and that there's nowt wrong with your dick; just stick to older WG's. You'll be fine.