You are correct it is all about the glass, but your eyes don't dialate as much as you age so your night vision suffers. If your exit pupil is smaller then you won't be able to use the extra exit pupil a younger pair of eyes could. But young eyes or old will both suffer with poor glass.I really don't think it matters to your age either ..It's the Glass and it's coating.
the scope is only for killing the animal why the **** would you not be using binoculars????The answer to this is really simple. If you see something but don't know what it is then use your binos. If you see a deer (or whatever you are hunting) and want to get a closer look and a potential shot, then use your scope. Then you are already lined up for the shot and deciding whether or not to take it. If I had enough money for highend optics but only enough for one then I would put it into my scope. It is really frustrating to find animals with your binos at last light but then be unable to locate it with your scope. That has happened to me before. And that scope gives your your last look at the animal before you commit to squeezing the trigger.don`t eat this its crap