I know from your other posts that you have a single boar and a sow herd.
As we advised then (if are not able to have you boar neutered and then bonded with the sows), your boar can live by side side with your sows for interaction through the bars (as long as the cage is secure).
However if you want have a new friend, then you shouldn’t wait for him to be older just because hormones are less.
Generally speaking, bonded boar pairs need to be kept away from sows. Your boar may well be used to sow pheromones but if you were to get him a new boar companion, then that other boar may not be used to them and may react strongly to being in the same room as girls. That has the potential to cause issues for a bonded boar pair - not always, but sometimes, so it is something to be aware of if you tried to find him with another boar and tried to keep the boar pair and the sow herd in the same room