Visiting my parents in New Hampshire this week, I spent a lot of time in the grocery store. As a matter of fact, we shopped for groceries every single day. According to industry experts, seniors are the most frequent shoppers, averaging more shopping trips annually than any other cohort. Why? Possibly because seniors are less able to carry heavy bags and are more likely to be financially strapped, so shopping on an as-needed basis works for them. Over the next 10 years, U.S. households are predicted to grow 8 percent, according to market research firm A.C. Nielsen, but households closer to the poverty level are expected to grow twice as fast, at 17 percent. The majority of this growth is attributed to seniors living on limited budgets. Cash-strapped seniors have honed their shopping habits in recent years as the economy has worsened. More seniors rely on a shopping list, even though research shows they spend more time in the store and travel down every aisle more often than...