We moved - just 80 miles - and are now near both children and grandchildren. In lockdown it is easy to see them, or some of them, for garden visits, drop things off, walk in the area.
But we moved for several reasons, not just to be near family. We made careful choices, future proofing our life, good transport, nearby shops, doctor etc., level access ( our drive was very steep before ), downstairs shower room if we need it.
It did mean that GC no longer came to stay for a few days, which I missed, but as they are now teenagers and with busy lives they probably wouldn't have wanted to now.
WE moved when we were in our mid sixties and DH said "Never again" as it was a huge upheaval to cope with physically and I would not want to do it again. For me, it was a case of coming back to my roots, not far from where I grew up.
If my daughter ever moves away, as she probably will once the children have left school, I would only follow her once I am on my own, and if she wanted me to and was willing to support me in old age.
I hope you are able to make the right decision for you when the time is right.