We were neither investing nor paying down the mortgage early in our case. We were spending the money elsewhere. I believe this is the reality for most people.
The former rule of thumb was to invest your age into these lower-risk assets. So, for example, if you were 30-years-old, you’d want to be 70% invested in stocks and 30% in bonds or other lower-risk assets.
If you leave that money in stocks for ten years or more, you’ll likely have more money than by paying down a mortgage.
Not everyone feels comfortable investing 100% of their money into stocks, even less volatile index funds. Going all-in on any investment strategy or asset class has more risk than what we are comfortable taking on.