It'll definitely be a nice data point.

It seems also just enough to say supporting people to have a hobby if they're at risk of dementia and don't have one is important to meeting their social and health needs.

I might be being too cynical. I wonder if there is some funding arguments, I.e. if it's for their health and insurer may fund it.

If it's for their social/cultural and general wellbeing it might be out of their remit somewhat.

> > The challenge however is, is it that those who engage in such hobbies have decline slowed. Or are they able to engage in those hobbies due to not declining.

> Maybe by comparing the comparative cognitive of twins, one of whom has a hobby and the other doesn’t?

I don't see how that would help in this case?