Getting an erection only helps part of the problem, the rest of the body may not be fit enough, I suggerst you give him a helping hand if you know what I mean.
I am 64 and have no erection problems, I do take Atenolol BP tablets, I find when making love to my Wife I sweat like a waterfall but cannot come to an orgasm, she gives me a helping hand afterwards, I like to make sure she has an orgasm first, there is more than one way to skin a rabbit.
JW
Why not try cutting back on the Saw Palmetto and the Horny Goad and see if it's better.
Phil