Like some of the other oldsters, I am interested in the experiences of those over 70. I first began to masturbate when I was 11 during WW II. No one taught me anything. I just started playing with my penis about the spring of 1942 and found out how good it felt. By that winter I was ejaculating small amounts of semen and once my mother commented on the spots on the sheet-this was what we called an outing sheet since it was a little fuzzy and was warmer for the unheated bedrooms.
I have never quit masturbating although I have been happily married for going on 54 years and still occasionally have sex with my wife. Recently I read two contributions on the frequency of masturbating and how many people might be doing it at the same time, etc. I found that fascinating.
This past year, I kept a record of my performance and recorded 227 orgasms (I did not count the times I masturbated or had sex with my wife but did not ejaculate). I had sex with my wife 19 times and masturbated 206 times. Counting only the times that I masturbated, that is just under an average of 4 times per week which I think is not bad for someone three quarters of a century old.
I also made calculations for quantity of semen assuming that I have ejaculated 20000 plus times in my life (I did it much more than once a day when I was young and on occasions up to ten times in one day.) Even this past year I recorded 16 days that I ejaculated twice and 1 day that I ejaculated three times. I also think it is safe to say that over my life time of ejaculating that the average amount has been a teaspoon or more although only about a half teaspoon now. At that rate, I came up with a figure of about 26 gallons of semen which is almost half of a 55 gallon barrel. Wow! And think of the billions of sperm in that much semen! But most of all think of all the fun I have had in producing it.