Now more than ever, food companies have an opportunity to tout their better4you brands to baby boomers  Boomers are more obese than other generations, a new poll finds, setting them up for unhealthy senior years.  And for all the talk of “60 is the new 50″ and active aging, even those who aren’t obese need to do more to stay fit, according to the Associated Press-Life Goes Strong.com poll.  Most baby boomers say they get some aerobic exercise, the kind that revs up your heart rate, at least once a week. But most adults are supposed to get 2½ hours a week of moderate-intensity aerobic activity — things like a brisk walk, a dance class, pushing a lawn mower. Only about a quarter of boomers polled report working up a sweat four or five times a week, what the average person needs to reach that goal.   – Rich