New Delhi, Nov. 14 -- A little over a year ago, when I interviewed DLF's K.P. Singh for Business Lounge, he talked at length about his companion, a woman about 20 years younger whom he'd met a little before his 90th birthday. He'd had a bad few years after his wife of 65 years died in 2018, and had had to force himself to return to his usual activities-work, golf, travel and music. In time he met his companion-though, as he put it, "that is a very risky thing at my age"-and found a renewed interest in life. "This is all nonsense that we should live in a certain way at a certain age," he said, referring to Indians' general tendency to censure older people dating.

Other Indians, fortunately, are beginning to think like him, and are activel...