Nerves are not what they used to be in childhood as you get older. You can understand older people when you yourself reach a point where you want to rest during the last days and spend your retirement, as pleasant as it may be.
Especially as an older person, you should have the nerves and life experience to cope with it. In particular, since kids are usually only at home from noon/afternoon or on weekends. Retirees are more than welcome to spend most of the day in peace. If you want it to be quiet all the time, please book the apartment in the cemetery.
Yes, children are louder than (most) adults. But that's great when children are around. Even better if they are reasonably well-behaved and don’t constantly go overboard.
I would be much more annoyed by neighbors aged 20-30. They are really loud when you actually expect it to be quiet. Namely in the evening and at night. But no discussion is ever held about that.