If you know you’re going to neuter him, do it while he’s young.
My Porky is not neutered, and mostly it’s been fine. The exception was briefly when we first arrived to stay at my dad’s house b/c of a broken pipe at our house and Porky went nuts marking. He smelled almost like a skunk.
Porky settled down, so no worries now, but had he not settled down I would be worried about neutering him do to his age. At this point he’s at least middle aged, possibly older since no one knows how old he was when he was abandoned on the shelter steps. He’s old enough at this point, that I worry about how well he would handle anesthetic.
There is a sweet spot for these things. Too young and his lungs are still developing and his bits are too small. Too old and hearts get weaker, muscles around the bits get tougher, etc.
So, while I don’t believe every male needs to be neutered, if you are going to neuter, don’t put it off.