I agree with several previous posters that much so depends on where you live, and on the age of the parents you're comparing yourself with.
I'm 63. My parents had just one car; my brothers shared a bedroom when we were children; during the whole of my childhood we had only 2 foreign holidays (usually we went to a B&B in Devon, or we stayed at home); I can't remember ever going out for a family meal at a restaurant; and the only takeaways we had were when my dad occasionally went to the chippy on a Friday.
I'm not saying this in a Monty Python 'Four Yorkshiremen' way - it's just how things were for a lot of people in the 1960s and '70s. There are lots of things that are miles better about life now!
Yet my parents did own their house (with a mortgage), and my mum was mostly a stay-at-home parent.
And I benefited in other ways too. E.g. I went to university and paid no tuition fees - I even received a maintenance grant.
I and my then DP (in our late 20s) bought a two-bed flat in London in 1988 for £78,000. An internet search tells me that £78k then is worth £211.5k today - but that particular flat was sold two years ago for around £535,000.
Tell me how two teachers/nurses/social workers/carers/cleaners in their 20s could afford that kind of price today.
(Obviously, that kind of property will be much more affordable today in other parts of the country, but I imagine that not everyone can find a job in those areas.)
Also, as suggested upthread, one huge problem is the cost of rents. I lived in rented flats for seven years in the early/mid 1980s, and my rent was never increased. Now I have a friend nearby (not London, but the SE) whose rent has increased every year since 2010, to the extent he's now paying almost double what he was paying 14 years ago. In such circumstances, how can renters ever save enough money to raise a deposit on a property?
I don't have children, but I look at my nieces and nephews - four of them at university or in the last year or two of school - and I wonder how they will manage to pay rent/save up a deposit for a place of their own, while also paying back their student debts, let alone spending on day-to-day living.