I specify actresses in the thread titles because it tends to be easier for men to be perceived as attractive as they go through middle age.
I am going to define young as 30 and under.
I decline to define hot except to mean “in the eye of the beholder.” I mean, I think Natalie Portman is the most beautiful woman alive today, but I know others who think she is, at best, average.
Natalie Portman, incidentally, is my pick. I recently heard a reviewer on NPR comment that her beauty actually makes it harder for her to be taken seriously despite her great talent, and I’d say that’s true. Should she opt to stay in the business, I think she’ll be active and acclaimed well into her 60s, if not longer.