The MacArthur Fellowship is an award issued by the MacArthur Foundation[?]. It is awarded each year to typically 20-40 citizens or residents of the USA.
Recipients must "show exceptional merit and promise for continued and enhanced creative work". As of 2002 the award consists of quarterly payments for five years totalling $500,000.
... 12.7% who are 65 years of age or older. The median age is 39 years. For every 100 females there are 104.2 males. For every 100 females age 18 and over, there are 97.8 ...