Having a child aged five, even if it was your first, wouldn't necessarily mean he was particularly young.

If you chase around on the net's genealogical sites I wouldn't be surprised if you mightn't actually be able to find a record of the death certificate somewhere.

Here is a site for the 1901 UK census - though I think the tight-fisted sods charge for some services. But I'm sure one way and another you get information about life in the Isle of Wight in 1900. It was one of Queen Victoria's favourite places - perhaps he got run over by a royal carriage...Most likely a farmer I'd imagine, and that can be dangerous enough.