My last 4 sessions have been dissapointing. Nothing to do with the ladies they were all wonderful.  The issue was me not being able to get to the main event? Doctor says nothing is wrong and won't prescribe anything. I love the hobby but why go on?

...but there are MULTIPLE threads regarding this subject on the 60+ Board. If this is applicable to you, you might want to check them out. There are MANY issues regarding lack of desire and/or ED and some of them are age related.

How much time do you give yourself in between play time?  Usually for me I play every 7 to 10 days. You might be playing too soon between seeing a girl. The older I get the more down time I need between play time.

Because it's there.

that we refer to it as "down" time.  Lol

..... cock rings. Works wonders for me. Just one more thing to try.

What, to you, is the Main Event? Your own shuddering finish? Penetration? Enjoyable stimulation? ... Sometimes, the Main Event is just "being there" and enjoying the company of a beautiful sexy woman.
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Since micktoz posted a (relevant) joke, so will I.  (Stolen from Lamont Cranston on the Humor board.)
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A women goes to her gynecologist  for a check up and the doctor tells her no sex for a week.
So the women goes home and tells her husband the she can not have sex for a week.
The husband asks, "What did the dentist say?"  
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Which Main Event?

I can't get hard enough to have sex. I'm in my 40's and had a marriage from hell. I thought my issue was because how bad things were between me and my ex but it has continued after the divorce.

There is some really good info above so don’t just give up. That said I’ll offer my solution.
I’m 71 with type 2. I still have a strong desire and that is the key. I get erect but it doesn’t last long. I’ve tried viagra and cock rings with no luck. FS was too frustrating so I tried massage. A couple of bad experiences then I finally found a beautiful girl. ( her body is great also). We rub cuddle etc. about the second visit I couldn’t orgasm and got upset with my growing old. She said “are you enjoying yourself “
I definitely do enjoy my time with her so much that I see and enjoy her weekly. We both orgasm every time now. We fondle rub privates etc. once she got me to enjoy what I do have I stopped worrying about what I don’t have. What I do have has gotten even better.
Lots of luck to you. As long as you keep the desire there is still a lot of enjoyment to be had

Go to a doctor and ask to have your T checked. My production was killed off by having chicken pox when I was 32.  
If your doctor isn't helping you, get another doctor. I did.

Sexless marriage? Did she beat you up emotionally? That shit can wear on a man's self esteem. It could be the big head cockblocking...

Nice post Dude, good luck. Try Clomid and female condoms, good luck

that you may want to pursue? tried different things, different providers. Sometimes is not a medication issue but a mental block... or something that you may want to explore a little further?  
I know first times can be a bit awkward, but maybe if  you have a regular provider both of you can explore different kinks?!  

Maybe your gay..

Also, you may need longer sessions - a tease, rest, tease, rest sort of event, relaxing nude in between. Key word, relax

And have four wives???

Coincidentally, I posted on a local board looking for a "patient provider." Jokes aside, this thread hits home.

your last four sessions were with the same or different providers but you may want to stick with ones you know while you're working on the issue. Its more relaxing walking in the door and seeing someone you know and trust rather than having added pressure and anxiety with a new girl. Just a thought.

NEVER Quit.
Sexual Pleasure
is one of the Greatest Pleasures on this planet.

So if there is a possibility of it being a psychological issue, maybe a true tantric provider might be able to help re-route some of the "blockage." I find that if I'm concentrating too hard on crossing the finish line, it seems to get farther away. The mind-body connection is a strange and wonderful thing, but sometimes I have to "head fake" myself and not concentrate too hard on the end game.

Supposedly if you are physically able, you will have erections during sleep. One verfication is to put a paper ring around your dick, like a roll of postage stamps. If the paper is torn in the morning you had an erection.

That's true, and the effects can continue well after the relationship ends.

...and it will probably happen more times than not.

Certain meds, like opioid pain killers will knock your testosterone down to single digits. Keith Richards must not have a penis after hisyears of opioid use. Demand a test for Testosterone from your Dr, better yet, find a Endocrinologist Dr. They treat low T and are up to date (hopefully)