I know it’s a cliché to lament the passage of time on your birthday. I don’t have a lot to complain about – I’m firmly in my mid-30’s, with a great family, good health, fun job, and all the trappings of a solid middle-class existence.I’m not that excited, though, by the reality that I am as close to 50 today as I am to 20. And while the trip from 20 to 35 was a fun-filled voyage, with young love, marriage, the arrival of children, travel to exotic locales, and the odd bender with friends, the trip from 35 to 50 seems likely to consist of an expanding waistline, receeding hairline, and the hardening of arteries, joints, and opinions.I am no longer part of the coveted 25 to 34 year-old demographic that marketers love. Instead, I’m now part of the 35 to 44 year-old club, a much less influential group.So, other than the reminder that the cold hand of death is just that much closer to resting on my shoulder, today’s a great day.