7.Your Friends
Regardless of how intellectually stimulating your conversations with your friends may be, they could still be good for your brain.
According to US government research, social isolation is a predictor of declining mental function in older age. Experts believe this may be down to not using a wide variety of communication skills. Research shows that the wider the range of relationships (family, friends, work and so on) a person has, the less cognitive decline they will experience with aging, so give your brain a further boost by widening your social circle.

8.Music
If you are looking to take up a new hobby, why not consider giving music lessons a go? Research results published in the journal Neuropsychology showed that musicians performed significantly better on several cognitive tests, perhaps as learning and performing music serves as a challenging exercise for the brain. Scientists also found that being a musician helped to prevent age-related decline in a certain part of the brain known as Broca’s area.