Mandatory Retirement

According to brookings.edu: 

 "Presidents of the regional Fed banks can serve until they’re 65—unless appointed after turning 55, in which case they can serve for a maximum of 10 years or until they’re 75, whichever comes first."

From pbs.org: "FAA Administrator Michael Whitaker said in a letter to two key senators that pilot fitness is critical to safety, and the agency should be able to create safeguards before raising the age limit to a proposed 67 from the current 65."

Federaltimes.com:

"CSRS and FERS law enforcement officers and firefighters are subject to mandatory retirement at age 57 if they have 20 years of service. An agency head can retain an LEO until age 60 if he finds that the employee’s continued service is in the public interest. The FBI has limited authority to raise the age to 65. While a CSRS LEO can be retained above age 60, it may only do so with the Office of Personnel Management’s permission. A FERS LEO may only be retained with the permission of the president.

Air traffic controllers must be separated from the service on the last day of the month in which they become age 56. However, that requirement doesn’t apply to someone appointed as an ATC by the Department of Transportation before May 16, 1972, or by the Defense Department before Sept. 12, 1980.

Foreign service officers are mandatorily retired at age 65."