When?

Yesterday I made sugar cookies.  I took out my cookbook that I have had since I was first married.  I opened it and all of the sudden, my Mom's cookbook flashed through my mind.  She uses the same one, but hers is an older version.  When I looked at my cookbook as I opened it on the counter, I suddenly saw the wear and tear on the well-worn book, the pages that were no longer attached.  I saw the yellowed page color and the stains from food dripping onto the pages as I cooked another meal or dessert.  When did I become the older mother?  When did I become my Mom? 

Crazy...