The family treating healthy aging like a team sport

Charlotte Lim (right) started strength training at her daughter Yan's (left) gym when she was 72. Amanda Goh/Business Insider Watching Charlotte Lim at work in the gym, it's easy to forget that she's 80. She does a pull-up, chin clearing the bar with ease. She drops to the ground and powers through a set of feet-elevated push-ups. Then, she grabs a dumbbell off the rack, holds it close to her chest, and drops into squat after squat. Lim only started strength training at 72. Before that,…