Not to make light of it, but this has been Grandma Sue's roughest century.She was all but self-sufficient until the age of 95, and still very much herself in her sharpness and personality through last year, when she hit the milestone of her 100th birthday. But it hasn't been the same for most of the past 12 months, with her memory and ability to recognize people slipping.The instructions are for no emergency life-saving procedures to be taken on Grandma's behalf. Last summer, I got a call early on a Sunday that she had collapsed. I'm about seventh or eighth on the protocol – it was as if the Secretary of the Interior had been told he was in charge. I stood there on the phone, faced, as far as I could gather, with the decision of letting her go. I wasn't prepared.