I like visiting nude beaches, last summer I took my wife and she enjoyed it, she mentioned that if she asked her friend to go with her she would, Her friend dosent want her husband to know, or me, so they are going together without me, I think about my wife being naked there with out me
I'm sure they will both have a good time. Just like on textile beaches, you get woman together, men, families, OAPs, students etc. Are you worried about your wife & her friend, and if so, why?
I've been to many nudist beaches that have all ages, shapes & sizes etc. It tends to be the smaller beaches I find that have a larger number of older people. The busier ones cover the whole spectrum of ages.
I live very near to a very popular nudist beach and the vast majority of people who visit are just nudists looking to sunbathe and do whatever they would do on a textile beach. But, there are always a few men trying to chat up female sunbathers, mostly they are older men and get rejected, but not always. So if you trust your wife and her friend you have absolutely nothing to worry about, yes they might be approached, but they'll say no. If they are looking to be seduced though, they'll find someone.
The wife's friend wants to try nudism "discreetly" with a someone who has experience with it - and is a female she knows well. A friend of ours did exactly that with her best friend while vacationing (I believe it was at Wreck Beach). Anyway, nothing "bad" happened, as they just kept to themselves, away from the "looky-loo's". I'd be more concerned with the husband finding out. He may be seriously upset that his wife went behind his back to be naked with another woman - potentially around other men. To the "typical" non-nudist, this may feel like there's something "kinky" going on.