I have found that as I've gotten older, I have to really read & re-read a recipe (as I am making the dish). Over the past few years I've found myself leaving out ingredients, not mixing them in the right order, etc, etc, etc. I have to constantly refer back to the recipe which I did not have to do so much in my younger years. Even things that I've made a zillion times still now require me to be more diligent in reading the recipe/instructions.