Exit Pupil

Greetings,

About 6 weeks ago I purchased a pair of Leupold 10x50 binocs. This means
that these binocs have an exit pupil of 5. Right? The problem with these is
the field of view is smaller than what I'd like.

I've been reading that as one gets older, the pupil doesn't dilate like it
used to. I'm 47.5 years of age. Have I reached that point?

I ask this because I'm considering buying some binocs(used) with a wider
fov. I'm considering 7x50, 8x40, 7x42 and 8x56( maybe you folks have better
suggestions).

Will the 7x50's and the 8x56's have too large of an exit pupil. My thinking
is for astronomy, the more light the better. Is this thinking correct?. How
will having too large of an exit pupil affect my astronomy observing? I
know the 7x50's and the 8x56's have an exit pupil of 7.1 and 7. Is this too
large an exit pupil?

Would I be better of with 7x35's instead of 7x50's? 8x40's instead of
8x56's? Help!

Mike