What kind of design is this? It offers a high-end body and a mid-range brain when one is young. When the mind reaches the maximum level, the body switches to the "energy-saving mode". Why do people's minds become increasingly rich as they age, but their bodies become weaker and weaker?
I think this should be the iterative mechanism of this world, providing a fair chance for those who come after. If one's body and mind become stronger and stronger, the strong will always get stronger, and the latecomers will never be able to compete with their ancestors. The world was gradually solidified and lost its vitality. Thanks to this mechanism, seniors can be willing to pass on their knowledge and experience to those who follow, and this cycle repeats itself.
So, life is a journey that the body and the soul walk together. When it's almost the right time, it's time to part ways and let yourself go.