Is it common for middle aged women have affairs with their gym trainers?

I have been talking to a few women in my age group (45 to 55) - at work, friends and all. What has been surprising is that many of them are dating their young gym trainers. I have detailed two cases below, but I am wondering how common it is? ITS folks - please share your experiences. Many others I talked to are also saying the same.

Woman1: 48 - happily married, 2 kids - one 21, one 19, husband senior exec in MNC. She started gym last year and confessed that she has been regularly fucking her trainer (25) since the last 6 months.

Woman2: 54 - happily married, kids stay in other cities (one is married), husband is a govt officer. She has been into fitness since years, and tell me that this affair with her gym trainer (23) is her first, and has been having an affair with him since 2 years.

Both of them are well aware that these gym trainers are pure physical relationships.