I'm currently struggling on how to approach certain questions systematically given that I don't have a philosophy background. Here's an example of such question.
Imagine a hypothetical future where we have the technology to safely -- no negative health side-effects -- transition to your desired sex (male or female).
Q: What is the appropriate age to choose your own sex?
Can you advice on how I could break down the question so that it's not closed due to it being subjective?
My intent is to investigate how we to think about when a person should be able to determine certain aspects of their own future.
In most places, parents determine many aspects of their children's future for a certain period of time. This could be because young people are not deemed responsible enough, or maybe cause they would not be expected to understand the long term consequences of a decision, or maybe other reasons.
What is the branch/sub-field of philosophy that deals with this kind of question?