Yep, and tbh, whilst I know 2 childfree women - in their 50s and 60s (one widowed, one single for 20+ years) who are quite lonely, and are a bit afraid of being alone and struggling in their old age, I do know another 2 who are very happy, with a large group of friends, and an active social life.
I also know 4 or 5 people in their 60s and 70s who have children, and they have little or no relationship with them. The children left the town they grew up in (or even left the country,) and they're lucky if they see them once a year. They won't be stepping up and caring for them when they need help and care.
I also knew a lady who lived near me (she died aged 88 two years ago,) and she had five children. 4 sons and a daughter. Just have a guess who ended up having to care for her when she got elderly and infirm and couldn't drive anymore, and had to drive her around everywhere? Yep,the daughter!
The FOUR SONS, FOUR of them - 2 older and 2 younger than the daughter - couldn't be fucked to even visit her more than 2 or 3 times a year. So if she had not had the daughter, she'd have had no-one (probably!) Her DH died when she was in her 50s.
Same with another older lady I know (late 60s) 2 sons both in their 40s, and neither of them keep in touch with her or visit her. Like fuck will they be coming to help if she needs it.
Of course SOME people have good or great relationships with their children, and they do care for them/help them when they're older. (DH and I have a great relationship with ours fortunately - and they live not too far away, and I am fairly sure they will be there if we need them when we're older...) But it's not a given that if you have children that they will care for you when you get old and infirm, or indeed that they will be anywhere near you at all!