Which is your preferred weight for a woman?

I know feminists are going to say lots about this but when we make choices in life it is often our experience from a young age that provides some guidance. My Mama is still quite slim for a woman her age, and my Papa hasn’t put on any substantial amount in weight now his job is more sedentary. My brother too is slim as is his wife.
(I am using American weights here as they are confused by the metric system)