Question

select the word that means a fixed idea about a group that may be unfair or untrue.
american runner anne garrett didnt take up running until age seventy - two. at eighty,
she set a national record for the half - marathon in her age group. she defies the
stereotype that older people dont exercise, although she urges kids to run, too.

Explanation:

The question asks for a word meaning a fixed, potentially unfair/untrue idea about a group. The text mentions Anne Garrett defies the "stereotype" that older people don’t exercise—this matches the definition.

Answer:

stereotype