In the US, ageism is allowed as long it doesn't discriminate against older people(45 years old or older I think?). You're allowed to discriminate against youth all you want.
Offering a buyout is in no way discriminatory since it is voluntary. If it was forced buyout, then yes it would be discriminatory
Offering a buyout is in no way discriminatory since it is voluntary. If it was forced buyout, then yes it would be discriminatory