sol_remmy says:>"It appears to me that every bodily system slowly degrades as you age. Care to site any scientific studies showing that intelligence does not decline with age? That is a surprising claim to make."

Studies show that older people are smarter. Despite your apparent youth, I'm fairly certain you can find the relevant studies.

https://en.wikipedia.org/wiki/Fluid_and_crystallized_intelli... :

"In psychology, fluid and crystallized intelligence are factors of general intelligence, originally identified by Raymond Cattell."

Fluid intelligence peaks around 18 years of age, then declines.

Crystallized intelligence is your accumulation of knowledge and skill. It increases until age 65 then slowly declines.