Hes worried about losing his job in the future/aware hes 62 and lives for work. Hes becoming defensive and sees you as the threat (part of a perceived threat).
Ps. If it is the above, just understand it (we will be in the same situation possibly one day) and work round it. Dont let him bully you though, just ask for a word in private if he continues and to be honest you shouldnt pre-judge him on his personal life.
A friend of mine works for an Accountancy firm who recently decided to shed loads of staff in the cruelist possible way. A colleague of his had been with the company for over 30yrs. Lived and breathed his job in almost a Japanese way (my friends words) …….and the company sacked him- found a way of getting out of paying a large redundancy package.