Fintech is most commonly used by millennials. About 95% of this generation uses fintech products, and they're more than twice as likely to use them than baby boomers, for example.
This is primarily due to the fact that millennials are more comfortable with technology and are more likely to adopt new ways of conducting banking transactions quickly. They're also more likely to be comfortable using mobile payments and sharing their personal information online, making them prime targets for fintech products.