Once you begin looking for joy, you can find it pretty much anywhere. When Jennifer McGaha's grandmother was in her late eighties, Jennifer asked her what her favorite age so far had been. ""Fifty-five,"" her grandmother answered, as though there were something magical about this stage of life, some deeper way of knowing from this vantage point. So, in her own fifty-fifth year, Jennifer began to take note. She jotted down her impressions...