Baby boomers’ retirement concerns are growing. Seventy-three percent of boomers plan to work past retirement, up from 67 percent this spring. Worse, 53 percent said they don’t expect to be able to afford a comfortable retirement, up from 44 percent in March. The span between these two polls, each conducted by AP-LifeGoesStrong.com, coincided with a 10 percent market drop, which rebounded last week to above 12,000 before plunging again amidst concerns over the European debt crisis. In all, 62 percent of boomers polled lost money in one of four key retirement investment categories: 401(k) funds, IRAs, personal investments, and real estate.