Hmmm? ''old lady''? thats kinda dangerous phraseology. perhaps "She who Must Be Obeyed", or mother , or momma, might be more appropriate?
might save you from some retribution
. My Wife is 69 and I wouldnt care to have her catching me calling her "Old Lady" . I generally refer to her as the 'light of my life', or my beautiful bride, but hey, thats my way, go figure