@jetton well at last a Mastodon age poll that capture the older demographic.
There was another recent poll on age of user but it did stop at 40+, so starting at still 60 still leaves a bit of a gap to expand on.
For a survey of social medium users a survey on the medium is the sensible way to do it, though I think your comment is missing the /s tag: for surveying anything else it's not so good.

Declaration of interest: Age 72. Retired Statistician.