Because inflation erodes the purchasing power of your currency. It buys less.
But your paycheck goes up correspondingly. If you make $10,000 and pay a mortgage of $250 it's exactly the same as making $100,000 and paying and paying a mortgage of $2,500. Yeah, a dollar bought more in 1970, but people had a lot less dollars dipshit.
oh reallly? You think your paycheck goes up AT THE RATE OF INFLATION?
You must be a government employee. Most people lag so far behind inflation in pay raises they have a helluva time staying in their house, let alone keeping food on the table for the next few YEARS till pay catches up... kinda. Remember compared to the 1960's the income purchasing power is far less.
You don't remember the 70's I see. Ask your grandparents.