It's wrong to discriminate based on age.
Bill is deciding between a 55 and a 28 year old applicant for a position in his tech company.
Bill wants to hire the best candidate for the job.
Bill hires the applicant that will better contribute to the companies growth.
Bill decides to hire the younger candidate because he feels his youth will give him more vigor.
Bill gains the right employee for the position.
Bill substitutes vigor for experience.