My 50s era ranch home is wired using cloth-covered NM, as you can see in these photos (taken in a basement closet located under the stairwell where the NM is run exposed):
Should I be suspicious of this wire, or is it still good for a significant service life? Also, will I have to pull an outlet or switch to tell if it carries a ground wire, or is that ruled out by the age of this cable? Was cloth-jacket NM ever made with a ground wire?