Crossword puzzle making and Sudoku do not prevent death from falling, according to a new study.
The idea of "using it or losing it" when it comes to our brain in a later life has been widely accepted.
But a new Scottish study showed no effect on mental decline.
Instead, the results show that regular life-long intellectual activities increase mental capacity and provide a "higher cognitive point" from which to decrease.
This study, published in the BMJ, was made by Roger Staff at the Aberdeen Royal Infirmary and the University of Aberdeen.
She looks at 498 people born in 1936 who took part in a group reconnaissance test at the age of 11.
The present study began when they were about 64 years old and they were summoned to test memory and mental processing speeds up to five times for 15 years.
It has been determined that commitment to solving problems does not prevent a person from falling.
This, however, meant that they had a higher starting point from which there was a decline and therefore delayed the moment when the depreciation became significant.
Previously, some studies have found that cognitive learning can improve some aspects of memory and thinking, especially for middle-aged or older people.
They found that so-called brain training can help older people manage their day-to-day tasks better.
There are no studies that show that brain training prevents dementia.
And last year's Global Council of Brain Health report recommended that people participate in stimulating activities such as learning a musical instrument, quilting or gardening, rather than brainwashing to support their brain function in a later life.
She says that the younger a person has started these activities, the better their brain function is as they age.
Dr David Reynolds, chief research fellow in the Alzheimer's study in the UK, said the study adds to the "ongoing" use or loss of "debate."
But since the study does not consider people with dementia, "we can not tell from these results whether specific brain-training activities could affect a person's risk of illness."
"In addition to staying mentally active, maintaining physical fitness, eating a healthy balanced diet, smoking, drinking within the recommended guidelines, and keeping weight, cholesterol and blood pressure under control, all are good ways to maintain a healthy brain .