I've masturbated at least once a day for most of my adult life. Sometimes multiple times in a day, but I never liked going more than 2 or 3 times. Over the last couple of years I never really exceed once a day, with probably less than 20 days in that time period in which I masturbated more than once in a day.
Now I masturbate every day, or as little as once every three days. There are some exceptions to this in which I go for longer, but that's normally not by choice. I feel like as I've gotten older I'm not sexually tired, but I'm actually exercising more control and deciding to make a better use of my time, or choosing to deny myself pleasure that I can put off to a later time.