an 80-year-old lady.a woman of 80 years old .a woman of 80 上述三短语都可以表达此意思. 注意用连字号是三个词当一个形容词用,不能在year后加-s.of短语后却必须用years.
an eighty- year- old lady / woman.
an eighty-year-old woman
an eighty years old lady
an old eighty years old woman