I dont think age has a lot to do with it,... its the person.
if he asked you to open a gate and helped himself to your coffee i wouldnt say thats useless,
to begin with , i would let that person know where they stand and who is the boss,... so the coffee thing would not have happened in the first place without me first offering him a drink,
The gate , i would have opened it only if the guy had his hands full,
otherwise he would been told to open it himself, and if that was such a task to him i would have told him there is no hope if he cant even open a a gate !!
35 and worldly wise he may be, but laziness comes with any age.
set him a couple of tasks
a target to aim for, watch his enthusiasm (or lack of)
see if he really has a go at them,
you will soon know what he is made
of.
can you be more specific regarding why you think he is useless?
Gary.