Hi, that wouldn't be good idea tbh.
Secondly, your younger male is still a baby and he will be 3,5 months old then so it's exactly when male rabbits start becoming hormonal and sexually active (well it's depending on many factors including their breed and personality, but definitely between 3 months and 6 months). So when he is not a baby anymore he might change dramatically and you can expect excessive humping, spraying urine on walls, other rabbits, you, marking territory with pee and poo etc. Your older male won't like humping I am almost certain about it, in some very rare cases when a male is super submissive maybe possible but most likely they will be humping each other and circling and then fighting. Ever if on exact date 14th of August they will look okay he will go to that teenage phase sooner or later and the fights may start when it all looked fine.
Firstly, I've heard of
@Diane R mentioned that she heard that one of her friends knew a woman who had two intact males (or even more) living peacefully together, but generally two unneutered males will fight for dominance, for territory and they can even kill each other, this is not something new it's a natural thing, especially when they are in a limited territory. Well, wait maybe you will hear some success stories here, I wouldn't risk that honestly.
I have successfully bonded two neutered males, was easier than I thought, but one of them has horrible scars he was all in stitches after he had a fight with his brother when they were 3,5 months old. People just got two little brothers from a pet store and they were nice and friendly so were housed together, then time has come and they started humping/circling but people had no experience with rabbits and didn't pay attention, then they had a fight with lots of blood, horrible wounds on ears, around eyes, noses, genitals, kids were horrified and boys were separated, they had emergency surgeries both and were neutered as well. Now one of the brothers lives with me and he is a very good and friendly neutered rabbit and bonded easily with other neutered rabbits.
I have more stories I don't want to post pics of the wounds here I will let other people make their comments as well, my opinion is that I wouldn't risk that. Get them neutered, wait for 2+ months then you can try bonding them.