Hes 72. He is ... She is 55. She is ... The period of life when you change from beging a child to beging a young adult ... The strange of life when you are 70 ... The opposite of life ... The beginning of life

He's 72. He is an old-age pensioner. He is in his old age.

She is 55. She is an adult. She is in her middle age. She is in her fifties.

The period of life when you change from being a child to being a young adult is a teenage years.

The age of life when you are 70 is aged man/woman.

The opposite of life is death.

The beginning of life is infancy or babyhood.