Depends.
There are the kinds of cougars that are pulling the "I REALLY WANT TO LOOK 20 AGAIN" and it just looks... bad, too much plastic surgery, or just the fact that someone 35, acting like they're 21 is just a turnoff, the appeal and the attraction is the older looks and behavior.
The rarer breed, are the women that just seem to take care of themselves better, or who knows maybe they just had a better plastic surgeon and didn't go crazy with it? It's a sort of je-ne-sais-quoi that shows a woman who's aged and been comfortable with it, enough to have the confidence to know they're still hot at their age- not someone whos insecure about their age.
Still, if we're talking realistically- I prefer girls my age