Is using zip-locked bags at restaurants a sign of growing old? i asked myself this the other day in a luncheon meeting attended in the main by seniors or mature adults as they’re now called by some. At the end of the meal, several opened their purses and pulled out their own plastic sacks for leftovers, and i recalled times I’d seen my older relatives do the same. Indeed, my father at about age 70 raided the centerpiece on the buffet line at a steakhouse, claiming, “Oh, they want you to take the whole fruits and vegetables.”