First off an 06 male would'nt be 6 1/2 years old...haha,unless I'm in a time warp.
As long as hes feeding,shedding,defacating and drinking I wouldnt sweat it.I have a 5 yr old male Biak that eats every other week,sometimes every third week and goes off feed for 5-6 months.If he's got good body weight and muscle tone hes good.He may need a girlfriend.