It's none of their business, mabye. But they all will have an opinion.

Even I did once. The girl who I was deeply in love with, she had a fling with a married guy. She was supposed to babysit their children, but this girl I put on a pistole, she decided it would be a good idea to have sex with him 'because he was experienced, and because he deserved it as he was in a terrible marriage'. I think the male was 33 or so at that point, she was 24 or so.

It hurt me so deeply. I cried and was jealous for the firs time. Helping this married guy cheat did more for her than my company, it seems. I called her to voice my disatisfaction. She was pissed. I wasn't even her real friend. Just some guy too scared ot take it further than platonic with her, despite my deep feelings. It wasn't my business to give her unwanted advice. And I think I remember she lamented to me that all her true friends had told her the same thing, and that that was painful to her as she thought she was having a nice experience.

Now, that's not just an age thing of course. But if the people close to you disapprove of your partner, then that is hard.