Everyone should try to take good care of their bodies, at any age. Humans are not meant to eat junk food all day and never move their bodies, but sadly this has become an epidemic in the modern world. Also it saddens me to see the women who ''give up'' as they get older, stop grooming themselves, staying in shape etc. Age is not an excuse to let yourself go. Here in Norway I see so many middle aged women who have just given up. If you won't stay in shape for yourself and your own health, which is the most important, at least do it for your husband/boyfriend and your relationship.
It's so funny how girls always make sure to dress nice and look on point in the beginning of a relationship but then gradually start to give fewer and fewer fucks about their looks. Not healthy for any relationship.