I have looked on the census for East Riding of Yorkshire, some 300, 000 entries altogether and found just one John Young aged 5. born Hull living in Drypool. This is a place in Hull I think, but it is the only John Young listed born in Hull, in the whole of the East Yorkshire census, so if your details are right then this is your man!
There is another John Young aged 5, but he is born Glasgow, and living in East Sculcoates.
John is living there with his mother, Ann who is head, aged 42, a laundress, born Hull and a widow. She has a son called William, a lath render, born Hull aged 20, Henry aged 8, born Hull, and James aged 3 born Hull.
The reference is RG/3580/04/75