The first 20 years of an average person's life are largely spent on consumption: eating, sleeping, shopping, learning and repeating.
Then, reality strikes: working, paying for everything, supporting own family and navigating bureaucrats who create laws and regulations. By age 21, some individuals become hardcore nihilists, unprepared for the true challenges of life?
We must have billions upon trillions of live evidences of generational development of new limbs and new organs in nature. Yet, we have zero evidence. (... The foundation of evolution: we are in the middle of evolutionary processes, and evolution cannot pause for a second: every birth is part of evolution...)
Correction: The word is Evolution. Yes, I was forced for years to study the theory of evolution in the atheist-evolutionist USSR. After the Soviet Union fell, 80% of printed books about communism and evolutionism were burned by its own citizens.