Your 20s were all about setting up your financial foundation and establishing good habits. Your 30s were about life changes like getting married, having kids, and building your career. In your 40s, everything is amplified even more. You've got growing kids and aging parents — and what you don't have is a ton of spare time. There's a lot you can do in your 40s to protect your money and care for your family before you begin thinking about retirement in your 50s or 60s. Here's what you should avoid: 1. Buying more house than you can afford With your growing family, that starter home in a bad school district isn't meeting your family's needs anymore. Suddenly, you want more space for your kids to run around, and you want them to grow up in a neighborhood with lots of friends their age. It's tempting to opt for more square footage, a larger yard, and an upscale neighborhood. But this means a bigger home loan, increased maintenance costs, ...