Our first mortgage was at 15%, I'm talking 1980s here. It was a tiny box of a place, we didn't even have the money for fees, which I had to borrow, it came to £900!! We got a 100% mortgage because we didn't have any savings, we were fresh out of university, been working about 2 years and were renting, no family money or help behind us. It was a risk, but it paid off.
House prices were rising fast even then, we sold that flat within a year (put it on the market after about 9 months and completed 3 months later) and by then had managed to gain £7000 equity which was our 'deposit' for a little house on a housing estate; we weren't in that long before we traded up to a 3-bed as we'd started a family. By then building societies were lending on 4 x joint salaries.
We weren't in high paying jobs and did it from nothing. But other costs weren't as expensive, by the time we were in the 3-bed, the mortgage was at least 50% of our income. Things were tight but we still ate, clothed the kids (toddlers) and I stayed at home, so no childcare costs.
There were no mobiles, no internet charges, fuel bills weren't excessive, we didn't worry about petrol costs.
It was a different world though, our first flat seemed excessively expensive (as we lived down south at the time) at £23,500. When we finally sold our 3-bed and moved to a different part of the country we thought we'd won the jackpot, as it sold for £150,000!!