Mid 50s couple here. We have an ongoing thing with a guy we know for mfm fun. 99% of our fun has been with him. He's younger, skinny nerd type, pretty good sized dick. My 50+ year old wife could loose 20 lbs but she looks GOOD. Modern haircut, wears just the right amount of makeup, stands tall, speaks with confidence. Of course she thinks she's way past her prime. She's not fat, nice natural tits that sag just right, firm butt. She looks absolutely stellar when she's having sex with him, our friend says same watching us get it on.
Our nights with him are pretty relaxed, we often have her put on her high heels and parade around between rounds, she's into it too.
All this has really given her confidence in her daily life.