Hummm, well my first husband of fourteen years was 5 1/2 years younger than me. My second husband of twenty years is 8 1/2 years younger than me. We got together when he was 28.
A lady I work with is in a long term relationship with a fellow who is twelve years younger. Their relationship began when he was 26.
My brother's wife is older than he is by eight years I believe. He married her when he was 21.
The young will also eventually get older and wiser. Whether or not they choose to stay with the older woman is a test of the commitment. For us it works really well. We compliment each other on the same mental, emotional and physical level. Our interests are the same, so we connect in many unique ways.
The young are eager to satisfy in many ways and the mature woman is more usually more experienced, but sometimes that is reversed. In our situation this was so. Those differences in the mix make a pretty good sexual relationship. But sex is such a small part.
I've always been very mature but appear much younger. I was so apart from the world in my youth, that I must have been trying to "catch up".