You buy a $700,000 house at 30 (6% interest rate, 50 year term).
After 10 years (you're 40 now), you ask, how much of my $3,666 monthly payment went to paying down this fxcking mortgage?
Answer ~$332
How much of the payment is interest: ~$3,333
btw, that $3,666 is before property taxes and all your other bills.