From an article on FYI Living, published 6/15/11:
"Engaging in musical activity for most of one’s lifetime significantly helps remember names, and enhances nonverbal memory, the ability to work based on what one sees, and mental agility during old age. The habit of physical exercise, in addition to musical involvement, further adds to mental lucidity in old age. Starting musical training early and continuing it for several years have a favorable effect on metal abilities during old age. Musical training also seems to enhance verbal prowess and the general IQ of a person."
Read the full article here.