Increase in age, loss of intelligence
by Andrew Arnold
I think the possibility for this theory lies in the probability that we lose "capacity" for intelligence as we age, due to certain predispositions that we may acquire along our journey.
But what do I know... it's just a thought.
By the way... this site has tons of spelling errors and/or grammatical disagreements. For instance: " An IQ scoring of 140 to 145 definitely qualify you for this category." This should read: "An IQ scoring of 140 to 145 definitely 'qualifies' you for this category."
Sorry, it's a pet pieve!