Brain-fit­ness indus­try caters to wor­ried boomers (Crain’s): “Mr. Fernandez…compares the brain-fit­ness indus­try of today with the phys­i­cal-fit­ness indus­try of half a cen­tu­ry or more ago. Where­as once there were no health clubs or per­son­al train­ers, today they’re ubiq­ui­tous. “Who will be the per­son­al brain train­ers of the future?” he says. “Are they going to be…