At 18% interest which happened in the 70s your yearly payments would have been 14468.02 or 36% of your income. A couple years ago you could get 3% rates and so your payment on that house would be 40473.98 or 40% of your income, not much difference (and likely the house is larger). At todays 6% interest the payment is 57556.85 or 57% of your income and so not affordable, but this is a very recent thing.