I think most kids give up the nap btween 3 and 4 yrs old. DD gave hers up at 3.5 yrs. What you will notice is that nap will move a bit later, as he grows he will be able to handle more A time, and won't be tired at 12:30, so maybe then he'll nap from 1 til 2:30. Then he will not be tired at 1, so nap might move from 1:30 til 3, and so on.
When we gave up nap, dd was wanting to go down at about 2:30 and sleep til 4:30. That was pushing her night bedtime way too late, as she wasn't sleepy until like 10pm! I tried to put her down at 2:30 and wake her at 3:30, but that was a NIGHTMARE...she'd BEG me to leave her alone, it was awful.
I do miss that time to myself, but most nights she goes to bed sooner, giving dh and I some time, so it's all good!