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I remember reading that as one ages, their maximum exit pupil becomes smaller, approximating less than 5 by the time one is 50.

Therefore, seeking to achieve an exit pupil of ones optic above that number would gain nothing for that particular individual. In other words, going to a larger objective diameter for a given magnification might actually be a waste of money and space, more weight, etc.

BTW, I think you meant the exit pupil is calculated by dividing the diameter of the objective lens by the magnification.
 
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