I published some new research in the Journal of Consumer Affairs!
We find a negative association between the ability to complete financial calculations and age, with an even more negative relationship after retirement. This may suggest limits to career extension, or alternatively, that extending some types of careers could provide cognitive benefits.
Regardless, the implication that staying active as we age is clear!
You can see the full article here: https://onlinelibrary.wiley.com/doi/10.1111/joca.12353