 Setting aside this version of the arbitrariness claim what remains of the charge that ‘[a]ny line which uses age to distinguish people with rights from people without can be shown to be arbitrary’? There are two ideas. The first is that although the threshold of age does serve to mark a difference within the class of human beings it is being human as such which is important. Or, relatedly, what is being distributed, namely rights, is so important that all humans should have them. It is being human which should make the difference not being of a certain age. Rights are too important to be denied to some humans on account of their (lesser) age and given to others on account of their (greater) age.