Hi !
Phil's case provides support for the "wear-and-tear" theory of aging.
Perceptual speed is ability to quickly and accurately make simple discrimination's in visual stimuli. <span />
The World Health Organisation recommends 60 minutes of excersize a day, 5 days a week.
An eating disorder research website or a Mental health research website such as National Institute Of Mental Health. It can help you keep up to date because websites are most times updated with new information and easy to access now a days.