New Delhi, June 21 -- At 44, Harpreet Vir Singh doesn't just run a wellness company, he lives its philosophy. The founder of Your Happy Life (YHL), Singh is a longevity evangelist with a clear-eyed vision of what ageing well should look like.

"I want to be able to go on treks, travel, discover new places and experiences, even when I am old," he says.

His goals are precise: lean muscle mass, deep sleep, biological metrics that track healthy ageing, and a supplement stack that includes NMN (said to mitigate ageing-related disorders) and Shilajit. Not because they're trendy, but because they work for him.

Singh, with such a clear blueprint for his 70s, 80s and 90s, is still cautious. "I don't believe Shilajit is a cure-all, but I do feel ...