Personally I think its just age. I have good eyesight myself but it seems that it wasn't as good as it was when I was younger. My doctor said my arms are getting too short when I told her I am starting to have problems with small print. (eye exam showed nothing wrong, I just can't read small print anymore).
I am okay at night if the roads are lit but if i'm someplace like out in the country where the streetlights are far and few between I have to drive slow and really pay attention to where my headlights are pointed. I'm over forty.