When you're cumming take your free hand and press really hard on the patch of skin between your ass and your balls. This restricts the flow of cum and the back pressure really enhances the orgasm.
Make sure you are will hydrated (sounds obvious but it's true); also, 25 mg of zinc every other day has a definite positive effect in my case, as well as l-citrulline. And of course, take your time, although it's easier said than done at that age if I remember correctly!
You know I've been thinking about a fleshlight for a while. Never tried one. I'd have to talk to the husband about it to see what he thinks. He'll be fine with it I'm sure, with his cock rings and the poppers he used to enjoy LOL. Not to mention his dick pump, although he's not small at all - just for fun. Maybe I'll get us a pair!