I need it explained to me how age discrimination laws are fair for young people?

[Barbara Doll to you]

Old people have all the experience, but they can lack the dynamism of youth. Young people have little experience, but can bring new ideas and vitality to a job. Sometimes smaller companies need younger people to take over when the older ones retire. This is fair and the employer can choose which they want.

How does a young person get a job if an older person with experience applies? Age discrimination stacks the deck against younger people.