To date, 75 pro football players have spelled their last name G-R-E-E-N.

Greens have included the Cleveland Browns' Pro Bowl running back Ernie Green (1962-1968), who gained 3,204 yards and caught 179 passes out of the backfield in his six-year career (while blasting open running lanes for his Hall-of-Fame teammate Jim Brown), and the Redskins' speedy Hall-of-Famer, "The Ageless Wonder" Darrell Green, who played 20 seasons from 1983-2002.

But they're not the only Greens associated with agility, stamina and longevity.

The amazing power of greens is also highlighted in a new study from Rush Medical Center in Chicago. Researchers followed more than 950 older adults, average age 81 (Ernie is now 76), for 2 to 10 years and discovered that folks who eat one to two daily servings of spinach, kale, mustard or collard greens have a cognitive ability that is 11 years younger than folks who skip those good-for-you leafy veggies.

The researchers also found that in addition to the lutein, folate, and beta-carotene in the greens, vitamin K was a key defender of brainpower.

Clearly, whatever your age, it's a good time to make sure your diet is rich in greens and other sources of these brain-loving nutrients, such as brightly colored fruits and vegetables.

Cooking up soups, side dishes, casseroles, and salads that deliver the greens will keep you playing at top form for decades to come. You can even toss in some omega-3-jammed walnuts.