I am considerable older than you. I found that after my surgery I was not getting back to how I was before. Full erections just did not happen with pills or pumps. So..I tried Caverject and then went to a BiMix. It works every time and has restored our sex life. It is not perfect and it is not as good as before, but it is what it is and We enjoy it every time.
Bimix injections are easy to do and as time goes by are not a problem. We don't even need to plan ahead. When the mood strikes us..one or the other or both, we just say lets do it, and 10 or 15 minutes later I am ready to go.