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Hi Matt,
What does change is your ability to focus, but any telescope focusser will take care of that, easily. But you have already lost this in your 40's.
Whatever you find comfortable with regard to eye relief doesn't change with age, unless you want to wear specs to observe - I take mine off some of the time.
Main reason I keep mine on when observing at a star party is to ensure the focus is suitable for others with more normal sight.
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