I'm a millennial. I will retire in my seventies. Many in my age group will be still paying their mortgage off well into their sixties. Many will never be able to buy. This is not a moan about that.
My mums generation were able to buy cheaper houses in the eighties. Some have also inherited well (houses which their parents owned and didn't have to sell to pay for care, which had risen in price to above a million). They had better pension plans. Some were able to go to university for free and their degrees actually meant something in the workplace: They often paid off their mortgages in their forties. I see a lot of my parents relatives have retired early and have very enviable lives.
Two uncles have retired in their early sixties. They are both in good help. They spend their days on many holidays, eating out multiple times per week, going to garden centres, renovating their beautiful houses, helping children financially and with childcare. They will have presumably worked out their finances and could afford to continue to live like this for the rest of their lives! Possibly thirty more years!
I think they are possibly going to be unique in their quality of life. We will never have that and I don't see my children's generation having things any earlier.
In essence the generation before me were mostly fortunate, unless personal situations changed their financial situation or they lost their homes during the nineties interest rises. Retirements and pensions were never designed to support people for three decades and that things had to change hence raising the retirement age and making people pay more towards their care.