Plus 50 isn’t old!
Agree, but tell that to the many businesses who discriminate against over 50s jobseekers. It's a widely reported issue.
But also the statistics are for people over 50. They're not all 50. Some are older.
Even the ones who are only 50, it's much harder to get a first time mortgage at that age. Especially as that group of private renters (over 50s) are statistically the poorest group of private renters. Statistics also show many have been in poverty for most of their working age lives.
These are people who do or did the important but lower paid jobs, or are disabled, or are in poverty after a Shit Happens life event (divorce, domestic violence, bereavement, caring for a disabled child, illness, lone parent where the absent parent fucked off and didn't pay child support etc).
Those who rent often made a choice to rent. As my family members have. Their choice as they didn’t want house maintenance costs. Others were ok with making an effort to get a house.
Almost nobody chooses the insecurity of private renting and being at the mercy of a landlord choosing whether or not to sufficiently maintain the property, not to mention the unaffordability of private rents for people on lower incomes (and if they're pension age it's a fixed income), especially not long-term and especially not at that age.
Yes some people choose social renting. Perhaps that's what your family members have. It's secure and affordable. However there's not enough of it so some people can't access it. Also, lots of people even if they have social housing prefer to buy. Having equity in older age is very helpful.
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