People say that aging is a state of mind. To look at it that way is to understand that everything is a state of mind because we are a simulation viewed through the prism of the mind (brain) for experience. Outside of your perceptions - even with out-of-body experiences - nothing is real - ones and zeros in a matrix of existential archetypes.

Aging goes to your health. If you feel good you look good which goes to genetic programming and life experience. On a metaphysical or soul level it goes to how tired your soul is. Nothing wears a soul down more than emotional problems and living with the wrong people. When you're not in control of your life you age quickly.