Silly sounds a bit too ... soft?

I think it's silly because just getting old doesn't necessarily mean your eyesight would deteriorate, and if it did it wouldn't necessarily deteriorate in a way that you can't see the details of someone's face, and the deterioration could be compensated by glasses or something, and also even if he did start going blind you couldn't know that its timing would coincide with your getting older and uglier..

and when it is true what some say about growing wiser with age a divorce can happen anytime then.