From our experience (married for 54 years, known each other for 58 years) the most important aspect of ED is that you are keen to maintain you sex life and are able to communicate with each other.
I had RP 9 years ago a the age of 72. Having tried Viagra (and similar) decided not to go for an implant or injections but opted for a vacuum pump. For us it has been a fantastic success - I can achieve a very large and strong erection on demand. The main disadvantage is that foreplay has to be before using the pump: this is when good, free and humorous communication is important. When my wife is sufficiently aroused I go and use the pump which takes less than ten minutes. The only limiting factor is that the erection rings (yes, I use two to maintain a good erection) should be taken of after half an hour. Normally for most couples penetrative sex last for just minutes but it is of great benefit to my wife and enjoyable for me that often our intercourse lasts twenty minutes or more. I can go on at the risk of appearing boastful!
The use of a pump requires a great deal of patience and experience but it is really worth it for us, age 81 and 76. I thoroughly recommend it.