The decline in the use of cash is one of the more visibly evident Millennial trends. How many bars, stores, or other outlets have you been to recently which have accepted payments by card only? Twenty years ago, the majority of such retailers insisted you use cash, and would only take a card if you were ordering over a certain amount. Now, they're more likely to refuse your cash and ask for your card instead.
Marist, who run a lot of these polls, recently asked people how they like to pay for their shopping. 63% of those under 30 said they only ever used their card; that's twice as many as the age group directly above them (30 to 44). With contactless payments and mobile banking, card payments are seen as more convenient and less hassle when it comes to little details like waiting for change.