There are reasons to be skeptical, of both the quality of the evidence presented so far and the questionable assumptions that underlie claims of improved cognitive function after brain training.
Drinking among older adults is up. And while overdrinking may not pose an immediate threat of overdose, it is not healthy for seniors, many of whom take several medications and are at risk for falls.
As people's bodies age, so do their blood cells. This affects immunity and an ability to withstand certain cancer treatments. A recent study in mice suggests that those cells can be rejuvenated.