How long can a woman keep her body both shapely and very firm?

Depending on genetics, women can keep a shapely and firm body to the age of 60. A combination of good eating, aerobic exercise, and weight training will help any woman tone and firm up. Elinor Glyn (1864-1943) - that naughty woman of 'tiger skin' fame - somehow managed to look shapely into her 70s, so it can be done, given the right basic build. '