evidence here so the older mouse that exercise looks like the young mouse. on sheen says that the changes are down to exercise even in old age. levels what we're demonstrating and there are studies are newmans as well is that exercise helps even if you don't start till you're older anything is better than doing nothing and it's never too late to get. another lab at the university of mice are running around to their heart's content and their muscular activity has astounding effects as well they develop new cells in the brain that may not be a new discovery but now the researchers have shown. these additional nerve cells improve the precision of that memory capability that for.