You don't fundamentally change, you are still you, even if you are older. It's the same you, you just need to survive in the adult world. You don't gain adult powers, you just have to do adult things.
I realise now that to remain at one point of view is restrictive and will only provide a limited vista of the world. To jump from different perspectives of a problem, to assume different philosophies and view it through their lens in another light - that is how to live, how to work. To remain flexible, to keep an open mind, to not close yourself off because of what you believe in as absolute truth.