Egg freezing has found its way back into social media timelines, and this time, it's not through glossy clinic ads or celebrity interviews, but through a single line spoken by Upasana Konnidela.

MUMBRA, India — The afternoon sun shines on the woman in a commuter-town café, highlighting her almond-shaped eyes and pale skin, a look often sought after by couples who need an egg to have a baby.

The start of a reproductive revolution? A novel technique to “rejuvenate” human eggs may dramatically improve IVF success rates in older women, scientists say. “We have been able to achieve the first ...