Lear all you can. how can he do less work and not create bugs? (if he creates bugs, stop fixing his work and let the problem fix itself)
All in all, he is you tomorrow. You will get like him. Maybe there's a reason for that. maybe it's just indifference that comes with age. either way, i'd recomend you to learn his ways and start sooner, for as soon as you start that, you will get better pay, more respect, and a youger idiot to clean up after you.