18+ to early 20s - pretty much everyday, many days more than once.
Mid 20s through my 30s, married, probably only 2-3 times a week, because I was having sex that many times a week or more.
40s - the first wife was dropping off the sexual radar big time.. so probably 4-5 times a week.
50s - I remarried so it was again mostly sex for several years, she is now post-menopause so now it is on average 3 times a week, sex once a week sometimes twice. But my wife starts hand/bj one or twice a week also where I finish myself with her lying beside me. So if you add that - it would be 5-6 times a week.