Education is great, but it's only one piece of the puzzle alongside the environment, incentives, and expectations of a person.
Yes, people should start paying into a pension asap for compound interest, which is part of why there was a push for automatic enrolment because it was easy to see that it's difficult to do when there is conflicts with housing and food and many other things particularly if you look around your family tree and community and see a lot of people who didn't live long enough in good enough health to get a pension.
Yes, there are risks when not working with young children or ever, but I'm not sure a few lessons in secondary is going to solve issues around childcare cost & availability, a work culture that often doesn't work with caring responsibilities, and general messages around us about what is best for young children.
Many schools have been doing financial skills since well before Martin Lewis who did a lot to bring it more into the spotlight. Thing is, much like other classes, things we're taught at 14 can be a bit hazy and not really something we connect with at 24, even less when we're older, before getting into how much can change with new financial products and ways of using money. That's before getting to the great economic puzzle that even when well educated, people often don't make the most logical financial choices. There are other things infuencing choice than what would be the best answer on a test.
It's kinda like the argument about teaching healthy eating and the importance of exercise in schools. Yeah, it can play a role - but if education was all it took, we wouldn't see medical professionals with the same lack of healthy habits as much of the rest of the population. Knowing better doesn't automatically make doing better. Personally I think we need more of a culture of adult learning rather than pushing everything into schools and accepting that yeah, sometimes people do take risks, even when knowing better, and discussing what socially we think should happen when those risks come back to bite people. It's a difficult balancing act on an individual and population level.