Nor is it something we have to worry about. Our son and his wife bought a home in Vancouver and they paid off the mortgage in under eight years. I wish we had been as dedicated as they have been. It's great to be mortgage free while fairly young.
When we got our mortgage, I knew our spending habits, and I knew that we will be able to save substantial portion of our earnings. So I took a totally open mortgage, even though it cost me ½ % more. But the mortgage was totally open; I could pay off the entire mortgage the day after I got it, if I wanted, no penalties.
I also made a substantial down payment, much more than what was required and amortized the mortgage over 10 years, rather than usual 25 or 30 years. The advantage here was that with a 10 year mortgage, I was paying back significant amount of capital from the very first payment. With a 25 year mortgage, you hardly pay back any capital during the first three years. For the first three years you mostly pay back interest, very little capital.
The next three years I dedicated myself totally to paying off the mortgage (my wife leaves all the financial decisions to me). If I got pay raise, I increased the monthly installment. If I got a bonus, I made a lumpsome payment.
At the end of three years I was laid off. I used my severance package to pay off the mortgage in full. We had paid off the mortgage three and a half years after we got it. We were mortgage free at the age of 39. Then I was free to invest. I have been investing in the stock market for the past 15 or 16 years.
Mind you, if your son bought a house in Vancouver, he must have had a big mortgage. The prices in Vancouver are astronomical. We didn't have a big mortgage, I put 50% down payment and took 50% mortgage. So your son's achievement was bigger than mine.