Did you settle down young? It does sound mid-life, which is more to do with a stage of life than a biological age.

I settled down young and while I too love my husband & family I'm aware that I didn't have the wild young years some people have because of this - those years have gone now so I'm okay with this but it's a realisation I went through about 40-ish (I was too busy to think of it before).

Do you have any single friends in your life around your age? I do, and it's not a bowl of cherries for them, sure they can do what they want when they want but they don't have that bond and support from marriage - many of them seek it but haven't yet found it.

If you value your marriage maybe now might be a good time to do some of the things you've always wanted to do - with your wife too.