For example , 65 % of the older adults failed the extinction task of the arithmetical test , whereas only 29 % of the middle - aged adults failed the extinction problem .
For every test , the middle - aged group performed better than the older group .
65 % of the older adults failed the extinction task of the arithmetical test , whereas only 29 % of the middle - aged adults failed the extinction problem .
For every test , the middle - aged group performed better than the older group .