Forced retirement is technically illegal, but there are exceptions
Briefly

The Age Discrimination in Employment Act (ADEA) of 1967 technically prohibits forced retirement for workers over 40, yet exceptions exist for certain safety-related jobs.
Certain jobs, such as those requiring public safety like bus drivers and police officers, have age limits due to what are termed bona fide occupational qualifications.
Exemptions to the ADEA also include bona fide executive or high policy-making positions, where age limitations may be justified for valid business reasons.
Read at Fast Company
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