This lad needs an attitude adjustment.
Don't waste time nagging. Get a sheet of paper and rule a line down the centre. On one side list the things that you do to contribute to the running of your lives, on the other the things that he does.
Below that list the things that you find painful or difficult to do, because of your age and health.
If the list of what you do is longer than the list of what he does, ask him which of the tasks in the last list can be moved to be his responsibility.
If one of the jobs he walked away from was hanging this things on the line (you mentioned that in another thread) leave them somewhere visible in the clothes basket to get smelly. When he can't find any clean boxers tell him you can't hang up clothes any more because it hurts your back too much, he will have to hang them up himself or wear them damp.
How does he think he will survive at Uni if he can't lift a finger for himself? Does he think his tutors will come round and see to his laundry for him? There are lads who are as badly prepared as that - when my son started, he shared a house with boys who thought that you just shoved a frozen chicken in the oven for half an hour, then took it out and ate it.