The typical adult has retained 22 pieces of advice that their grandparents shared with them, a study has revealed.

'Good manners don't cost anything', 'you can only do your best' and 'treat others the way you would like to be treated' are some of the most common words of wisdom grandparents have passed on.

Other gems include 'never let your petrol go below quarter of a tank' and 'never go to bed on an argument'.