Jim, age 55, plays basketball with much younger adults and is concerned that his teammates might consider his age to be a detriment to their game outcome. His concern actually undermines his athletic performance. This best illustrates the impact of

Stereotype threat

Explanation:

Stereotype threat is the unpleasant situation in which a person seems himself or herself to be at the risk of keeping up to the stereotypes persisted by his/her social group.This treat can be based on cultural aspects, race, age,ethics, gender etc.

According to the question,Jim is displaying stereotype threat because he feels that his age can be an issue for football game results because other players are younger than him.Thus, he thinks he might face stereotype based on his age which is degrading his performance.