Like anything else it is a mater of choice. There is not a hard line on which side you have to be on.
The Queen and I over the many years in the lifestyle have experience many ranges of age with those we have played with. For us it was always a matter of personality, attitude and an ability to openly participate. We each have had a wide range of good, better and OMG experiences with a wide range of age ranges. One of my very best experiences was with a woman in her sixties and I early forties. We became FWB for several years and and each other’s go to at parties. I also had numerous experiences with younger women, single and married….and a few that became a poly relationship.
The Queen attracted many and like many other women in our circle of friends greatly enjoyed those mid twenties to mid thirties that could cum and bounce back quickly for more. Many of our MFM, MMFMM and GB featured younger men than the lady participants because they would pop faster and in a short time would come back for more. Many of them three times in an afternoon or evening gathering. Although her favorite was an older divorced man late fifties (about a 16 year difference at the time, clipped and snipped) well endowed and long lasting that was her favorite as well as several of our lady friends. His ability and skill, long lasting and the weird ability to cum on command, when the lady had had enough she would mumble cum or something along those lines and he would cum shortly after (women seemed to really like that).
Up until our favorite club closing last summer I enjoyed that position of giving, skilled, long lasting, bigger than most (8.5 to 9 X 6.5-7, depending) clipped and snipped. I was asked many times to be the extra in a MFM, solo and lover experiences. and by single/solo women in a wide range of ages as a trusted and safe play partner. I always referred to myself as a living breathing sex toy. And participated with many younger women and couples (30s - 50s, I’m 64) for their one on one, MFM/MMFMM and a few Cockold experiences. All great sexual fun. Only doing what they wanted never pushing the envelope.
so it really depends on your mindset and desires. And depending on yourself, length of time in the lifestyle and experiences you will find that your preferences will open up more and become a much wider range of activity as well as age mix.