I’m not in the cohort discussed in this article, but I’ll often go weeks without carrying any cash. I find the only time that I need it is on business trips when dining out with others, and have to split a bill. Even then, though, we often either have the waitperson split the bill on separate cards, or I’ll be the one to take the cash and put it on my mine (after which I have cash for the next time).

Maybe the difference between me and the people being discussed here is that I use credit, rather than debit cards. I can see how it would be tough to track your balance if you charged everything to your checking account.