Age is no matter when it comes to gray matter. Such seems to be the case with pint-size brainiac Heidi Hankins, a 4-year-old British girl who taught herself to read and has now been admitted to Mensa. The child has an IQ 59 points higher than the average score. Hankins isn’t the youngest person to be admitted to the elite society, however. In 2009 Oscar Wrigley joined with an IQ of 160 at the tender age of 2 1/2.