eyes

I didn't wear my glasses today. I wore my contacts. I feel like my eyes are getting older. When I look at my computer monitors with the contacts in I feel like my eyes are doing all they can to push back from my desk. I don't like wearing my glasses all the time but they don't make my eyes ache. When did this happen? Did I somehow mess up at the eye doctor? Or are my eyes really just getting older? Are bifocals in my future?