Alex Brummer: I'm working because I still believe I have something to offer today At a celebratory party in a friend’s splendidly floral garden this summer, I was greeted by a finger-wagging acquaintance. After all, as a more youthful colleague John-Paul Ford Rojas reported last month on mid-life shirkers, some 3,622,000 citizens aged 50 to 64 - mere striplings by …