Thank you for the response.No.
Once the clock starts on your age, they must let you get your 20 good time if you come back.
But if you’ll be past 56, you won’t be allowed to work past the 20.
Example:
Hire at 30, work 5 years. Quit for 10. Rehire at 45 with 5 years good time. You’d be allowed to work to 60 but not past.