I was really surprised and even commented to Mr Kitty how old Bratton looked. He doesn’t have the easiest of jobs.
It’s just common sense, if he has been on the force 44 years, and he had to be at least 20 or 21 after BLET, when he joined the force. so that makes him at least 65 or more...depending on age he joined the NYPD. He may have done the military at that time, as Vietnam was going on and the draft...so he could be older by three or more years.