There is another subject that may or may not have anything to do with aging.
That is how some people judge the color cast of binoculars. I have found my eyes do differ in seeing reds, and it was striking to me one fall when watching the fall colors when I found my eyes differ in seeing color.
I made a special thread about this finding a while back, and there is a nice discussion of the issue.
I find it very bad when some on here, who admit they have a similar issue, like to evaluate color cast in various binoculars, and complain about some, and really like others. That is ridiculous.
That is one strong reason I do not comment on color cast when evaluating
and giving my opinion of binocular models.
Jerry