Getting older changes your body. Muscle mass tends to decline, metabolism can change, hormones shift, and the way your body stores fat may change, too. That can make managing your weight more challenging than it was in your 30s or 40s. Unfortunately, many of the weight-loss rules people have heard for decades are either oversimplified or simply wrong. If you're over 50 and frustrated that the scale doesn't respond the way it used to, it's worth separating fact from fiction. M