Having or exhibiting the physical characteristics of age:
Separated in time, space, or degree.
Older people considered as a group. Often used with the:
Old or venerable.
Lacking feeling or sensitivity; numb or unresponsive:
2010, Stuart Mann & Gordon Murray, Art of the Formula 1 Race Car, Motorbooks (2010), ISBN 9780760337318, page 14:
Find another word for over-the-hill. In this page you can discover 12 synonyms, antonyms, idiomatic expressions, and related words for over-the-hill, like: past one's prime, old, removed, overage, overaged, elderly, gray, past, departed, dead and gone.