Average mortgage length is 10 years, I believe, which is why mortgage rates are usually close to the 10 year treasury rate. So, let's look at how much equity you have after 10 years in a 30 and 50-year mortgage.
Same but for 50 year:
Why is the government ballyhooing this like it's a good thing?
Google tells me the average age of a first time home buyer is now 40 years old. You will be 79 when you achieve 50% equity?
My heart hurts.