Elderly

Question 1

octogenarian

Answer 1

(n.) a person who is between 80-89 years old

Eg: By 2050, more than a quarter of the population will be over 65, and many of these would be octogenarians

Question 2

geriatric

Answer 2

(adj.) aged, elderly

Eg: Geriatric care-takers, mostly of low social economic status are finding it increasingly difficult to take care of adult children with disabilities as they aged