If I understand the purpose of that correctly, its to tear down the identity of recruits so that it can be rebuilt as part of the team. If its possible to do to a 40yo, it wont be done through screaming. I dont think it would be hard to tear down a 40y/o with other forms of belittlement, but like someone else said, 40yo bones dont heal as quick. I dont know if many would spring back.
40yos won't get any special treatment because of their age. They will be treated like others of their rank.