It isn't easy to compare, for example my then husband and I were saving like mad to get a deposit in 1970/71 for the mortgage we could get we could afford a nice 3 bed semi (£5k where we lived) but we didn't have the deposit. We bought a house in 1973, our money now bought us a rundown 2 bed terrace, it needed rewiring, new windows as the frames were rotten and new floorboards as they were rotten as well. There was no central heating. So we bought a £5,200 house, someone else could have bought the nice 3 bed semi for £5,000 18 months before us. They had a much easier time than we did.
Just to give a flavour of the value of money then my husband couldn't get the mortgage on his salary, 3 times was usual then, but with my earnings we just managed it. They didn't look at affordability then just income which was just as well as what I earned was wiped out by childcare.
Fast forward 2 years, house prices had slumped a few months after we bought the house, we spent alot of money on it and alot of blood sweat and tears and we sold it for £7k, if we had added up what we spent on it we probably made a loss. We were sensible enough not to do that.
The next house we bought was £9k, it crippled us and there were months when we didn't know if we would be able to buy food but in the long run we made money on it. Ten years later we got 4 times what we paid for it.
You could do the same thing now, people who bought a house 18 months ago have made money, people buying now might be at the top of the market and losing money in six months time.
So if you compare us buying a house at the top of the market in 73 with someone buying a house 18 months ago it would give a different result to us buying our second house when prices had dropped to someone buying now with prices high.
Go back to the banking crisis, about 14 years ago, people who bought just before the crisis were in negative equity for years in many cases, the people who bought after the crisis probably got a bargain.
It really isn't as easy as pick "the 70s" v "the 20s" because there are big variation within those time frames.