What you probably have is a low growth hormone level and probably low T. Have you had these checked? Your GH level decreases with age and at a certain point when it gets too low ED and PE occur. You can search ways to naturally increase GH levels cause it's a hormone that is hard to test for and treat. Sleep, exercise and diet are the most important things. Increasing T levels can bring your GH levels up a certain amount as well.
With age we lose sex drive. However there are safe exercises. Usually prostate becomes weak.These are few of good exercises which may hep you to arouse sex urge and get erection. Google Male deer exercise, kegel exercise,. Even cuddling without doing any sexual activity can give satisfaction. Try exercises.
You may do anal peripheral prostate massage. Learn this massage form google's website. It may help you .