Is it normal that at my age 57, one eye (left) seems smaller or may be doesnt open as wide as the right eye?

It would depend on your history, any visual symptoms or any other medical problems. Make sure to see an eye Dr for a complete eye exam and examination of your retina, extraocular motion and cornea. If your eye is normal, it may be a problem with the muscles that control eye movement and eyelid mobility.

As a neurologist, would address a recent change in the appearance of facial asymmetry, as a new nerve disorder. So, a larger eye opening on one side might be a facial nerve issue, or smaller on one side, a Horner's phenomenon. Hard to say what is occurring in absence of direct visualization. Maybe, see neurologist, or we could do virtual consult (www.connect@healthtap.com)