Do younger bunnies and older bunnies get along?

It depends on what kind of life the bunnies have been through. If they grew up without any siblings or with an abusive life, then they probably won't get along. On the other hand, if they grew up with siblings with a caring relationship, than the rabbit will probably get along. But if you try bonding 2 rabbits, keep close supervision for a week or two, and don't leave then without supervision overnight, just in case they don't end up getting along.