By 70 years of age, about one-quarter (27.0%) of the white males have become impotent; by 75 more than one half (55.0%) are so; and 3 out of the 4 white males in the 80-year group are impotent.
By 70 years of age, about one-quarter (27.0%) of the white males have become impotent; by 75 more than one half (55.0%) are so; and 3 out of the 4 white males in the 80-year group are impotent.