I am 57 years old and have been taking Sildenafil (generic Viagra) for about 8 years. It has been a huge success for me. I started having problems staying hard during sex about 10 years ago. I could typically get hard and start but within a couple minutes I would start to get soft. Then my confidence took a hit and I started having trouble getting hard period. While my wife was very patient with me, it greatly affected both of our sex lives. I finally went to a doctor who prescribed it. It was an immediate improvement. I got hard quick and would stay hard until I finished. I mean rock hard. My confidence came back and sex with my wife was like it was in the early days.
I haven't had any side effects other than a minor headache from time to time after taking it. The only down side was sex had to be somewhat planned so less spontaneity. Pills were in limited supply so I wanted to make sure sex was on the table before I took them but had to take them long enough ahead of time so they had time to work. But it was much better than the alternative. We figured it out.
We were swingers so my partners ranged in age from mid 20's to mid 50's. It didn't matter though because they didn't know I took anything. As for the actual sex, nothing changed other than me having stronger confidence so I was probably a better lover not wrapped up in my own head worrying about am I going to stay hard.
I highly recommend seeing a doctor and if he says it's the correct option... go for it. You will be happy you did.
One thing though, I was a little over weight, had high blood pressure, and not in great shape. A little over a year ago I started working out and living a healthy lifestyle (clean diet, no smoking, staying active). I lost 40 pounds and am in great physical condition now. I am now off my blood pressure meds and, I don't need my ED pills anymore. I still take a half a dose when I want to ensure I have the confidence or want that extra hardness, but I don't have to. There have been many of times recently when I have been able to complete sex without taking the pill. So for me, I think my issues were related to blood pressure and physical health. There are many reasons for ED though so seeing a doctor is important.