As others have said, it definitely changes with age, or at least it has for me. I used to ejaculate at least 3 or 4 times a week when I was younger, but it has definitely gone down as the years have gone by. Now maybe once a week, sometimes once every two weeks. One of the reasons I go so long now is that I want to save it for my punts, so I try not to "waste" it on solo activities.....