How to understand the life cycle hypothesis?

The life cycle hypothesis comes from a simple fact. People generally use the wealth that can be used for consumption on average in their lives. They have accumulated enough money in a few years when they can make money, so that they can continue to maintain the same consumption level after retirement. And this hypothesis deduces many conclusions that are quite different from Keynes through strict mathematical form. For example, a person's savings depend not only on his income, but also on his wealth, his expected future income and his age. This hypothesis also provides a possible and reasonable explanation for the Keynes-Kuznets paradox.