As Eepster said, there are no pressing health benefits to neutering males.
If he is going to remain a single bun then I’d say don’t rush it unnecessarily, let him grow and enjoy his love!
As AndHenry said, it may not be something you truly consider unless the undesirable behaviours kick in, and they can be…fun…to deal with
BUT….
I had my first bun, Sooty, from aged ten weeks, until he died, just shy of his tenth birthday. That little fella was a perfect gentleman. He NEVER sprayed, he NEVER mounted or humped anything, he NEVER nipped or bit us and he ALWAYS used his litter tray like a dream.
When we adopted Jake at three years he was unneutered. His litter habits were a little shaky (always aimed for the litter box, but sometimes got distracted by something shiny and ended up going right next to the box but not always actually in the box). He NEVER mounted anything or humped anything, though he did grunt amorously and had a funny thing about playing in long hair. He NEVER nipped or bit us and he NEVER sprayed.
Of course since we didn’t know Jake until he was 3 there’s a fair chance he exhibited all these behaviours at puberty and they faded with age.
I just wanted to share those experiences to show that neutering isn’t always a necessity for a lone bun.
Patsy and Pascal are both snipped now, the only change to their personality is that they have mellowed out a bit, but I mean this in a positive way – Patsy was so territorial she was on constant high alert, ears forward, ready to react to whatever she imagined was about to happen. Now that that aspect of her has been reduced she’s able to enjoy exploring again and playing!
I’ve basically got my pre-puberty buns back!