ageism (also agism)

n [U] (derog 贬) (practice of) treating people unfairly or unjustly because of their age 年龄歧视（的习气）.

afterlife, aftermost, afternoon, afternoons, aftershave, afterthought, afterward, afterward(s), afterwards, again, against, agape, agate, age, age of consent, age-group (also age-bracket), age-old, aged, ageing, ageing (also aging), ageless, agelong, agency, agenda, agent, agent provocateur, agglomerate, agglomeration, agglutinate, agglutination, agglutinative, aggrandize, aggrandize, aggrandise, aggrandizement, -isement, aggravate, aggravated, aggravating, aggravation, aggregate, aggregation,