Some paperwork follows you around: a parking ticket, a gym contract you can’t escape, and occasionally, a form that quietly waits six years for its chance to change a stranger’s life.

Matt Wilkinson, 24, joined the stem cell register in 2019 when the blood cancer charity DKMS visited his residence hall at the University of Leeds, as the Yorkshire Evening Post reported. Six years later, the events team worker and former competitive swimmer got a phone call out of the blue: somewhere in the United States, a woman between 50 and 70 years old needed exactly what his body could provide.

“The whole thing was a bit of a........

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