I would hypothesize that people would start with strong psychic abilities in early stages of their life, but the longer we live the more these abilities dull or become loss all together. Not because of old age, but because the accumulated disruptions to our minds with passage of time (radio waves, internet, brainwash media, indoctrinations, etc). We are constantly bombarded with psychic disruptions passing through as well as being reprogrammed to lose our abilities through brainwashing and indoctrination. We are made to conform to arbitrary societal constructs that work against us without realizing it.