 First, different rights may be acquired at different ages. After all it is plausible to think that the capacities needed for, and qualifying a person to possess, different rights are themselves different. More particularly, different rights would seem to require different degrees of competence. Liberty rights entitle their possessors to make choices, and the matters in respect of which choices are made differ in their complexity, importance, and consequential impact. Those who are allowed to choose require greater or lesser amounts of maturity, independence, and deliberative proficiency in order to be able to make these different kinds of choice. The decisions to marry, consume alcohol, serve in the armed forces, undertake paid labour, vote, buy goods in a shop, travel unaccompanied, and open a bank account seem to presuppose different levels of understanding and autonomy. Assuming that these levels are progressively acquired at different ages it makes sense to accord the corresponding rights not all at once but in stages.