I'm 73, still working, and walk 20,000 steps a day. I can do the splits — and I'm not slowing down.

Victor Chan. Amanda Goh for Business Insider. Victor Chan, 73, still works five days a week as a pool supervisor in Singapore. As a former bodybuilder, he believes regular exercise is key to aging well. He stretches regularly, practices splits and headstands, and walks about 20,000 steps a day. This as-told-to essay is based on a conversation with Victor Chan, a 73-year-old living in Singapore. It has been edited for length and clarity. Health is wealth, and I've always believed that. I'm 7...