This is the final part of a mini-series of three episodes in which we chat with Australian neuroscientist Dr Mark Williams. Dr Mark highlights why we should never stop learning, a lesson we live and breathe here at How to Choose! There are no more excuses that we’re just too old to learn something new. Old brains aren't less plastic, any difference is due to inactivity, not ageing. And finally he explains why socialising is one of the best things we can do for our brain.

Like to know more about Dr Mark? Visit Dr Mark's website - www.drmarkwilliams.com where you can pre-order his new book 'The Connected Species' .

Keen to dig deeper? A study of 27,000 people found that the earlier kids get smartphones the worse their mental health as adults. Check out 'Memory' by Lisa Genova.

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