Getting Old
The brains of older people are slow because they know so much. People do not decline mentally with age, it just takes them longer to recall facts because they have more information in their brains, scientists believe .
Much like a computer struggles as the hard drive gets full, so, too, do humans take longer to access information when their brains are full.
Researchers say this slowing down process is not the same as cognitive decline. The human brain works slower in old age, said Dr. Michael Ramscar, but only because we have stored more information over time.