Getting regular, moderate levels of exercise in retirement seems to be as important as getting your finances in order for later life.
Australian researchers have found that doing moderate exercise several times each week is the best way to keep a sharp mind in the over 50s.
They reviewed 39 studies to find a correlation between exercise and improved thinking and memory skills.
The research also found that it's never too late to start, even if you are already experiencing cognitive decline.
Doing more exercise in retirement isn't just about keeping a healthy mind.
It's a good way to reduce the risks of other health problems and to maintain a good social network, which has been shown to improve health and longevity in later life.
"Even if you are doing moderate exercise only once or twice a week there are still improvements in cognitive function, but the improvements were better the more exercise was done,"