Old couple problems

Help! My man and I are older Actually he’s a bit older than I but he’s getting to start to have trouble making it to the end and having trouble keeping an erection I actually get off better if he’s inside me, rather than being fingered and he gets off better with vaginal penetration than with oral sex. I don’t know how to help him. We’re getting frustrated but trying to be patient. We realize we can still have fun an enjoy each other’s love and company even if we don’t orgasm...but damn. We used to fuck like rabbits for crying out loud. He’s had his testosterone level checked and it’s normal. I’m wondering if he’s just nervous or having performance anxiety. We are trying to take our time. It’s been a while since we’ve been together this way so as I said we’re trying to be patient but if anyone has any advice that would be grand. Thanks