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

The answer to the question is stereotype threat.

Stereotype threat is defined as a feeling that an individual experience when she or he feels that they are going to conform to stereotypes about their social group, which in turn influences their performance in that situation. In the case of Jim, his fear that his age would cause his team to lose actually made his performance worse, thus leading to the outcome that he wishes to avoid.