This is a male perspective. I became single in middle age. I was happy single, briefly tried OLD (age appropriate) and found it horrific. I then avoided that and set about enjoying single life happy I was out of relationships.
I think a couple of things happen.
There are young women who want a Father figure in their lives. They will gravitate to older men who are not creepy, but it is safety rather than sexual interest. As men, I do not think we realise how many of our friends and colleagues are very creepy around young women.
There are also a minority of young women, perhaps 10%, who positively prefer middle aged men to young men. For there women, they are still likely to want a single man who has a high income ("has his shit together" as MN euphemistically put it), is fairly good looking, easy to relate to and not-creepy. The funny thing here is that the odds are not in the woman's favour. I was positively chased by my now wife who is very pretty, was 26 and I was in my forties.
I cannot argue is @Farmageddon, there might well be women who look to be taken care of. Certainly for those who want platonic relationships. For those whose interest, like @GidgetGirl, whose interest is in an intimate relationship, it did not seem like that to me. If they have something in common, it is an affection for their very old Dad.
Again, this is just my personal experience and many will know better than me.