Well, I just turned 33 so I'm guessing the category of 'pushing 50' would be what I would consider to be 'older women'.
I've always found Nastassja Kinski to be quite attractive and she's about 46 or 47. Meg Ryan is 45, but somehow I don't consider her to be 'older. Demi Moore is 44 and not unattractive.
Patricia Heaton (the wife on Everybody Loves Raymond) is 48. Megan Mullally (the sassy rich woman on Will & Grace) is 48. Debra Winger is 50. Annie Potts is 53. Jobeth Williams is 58.
Charlotte Rampling is 61... she was in a movie called Swimming Pool and Martha Stewart is 65. I doubt I'd turn her down after a couple glasses of wine.
I must say, I've never had a thing for Bea Arthur though.
Now, Estelle Getty... she's got spunk!