Mental retardation

Also, would somebody be generally happier the lower their measured IQ is?

There is nothing worse that being confronted with ones own limitations. When your memory starts going, that's when it hits you.

Flowers for Algernon.

Lordy yes to the memory going thing. Mine's getting really bad, and I'm only just out of short trousers. I've been trying to pinpoint something, anything, in my lifestyle that might be killing off brain cells, but as yet my efforts have been fruitless :( Perhaps it's genetic.

One of my old primary school teachers went senile in her fifties. Poor woman was only too aware of what was happening to her, but absolutely powerless to prevent it. Very sad.

Something related to this has happened in the family recently. Usually they don't know until they're told and then it's very painful. The person in question asked if I was too and was told, "No, she's just a perfectionist and a teenager, and that's what makes her that way." The problems are in my personality, not my brain. (arrr.)

There is nothing worse that being confronted with ones own limitations.
No, I disagree. If you don't know, you can be delusional. Thinking you can do it all. Knowing your limitations can enable you to change them.

One's limitation cannot be changed.