In Oscar Wilde’s novel “The Picture of Dorian Gray,” a portrait ages while its subject looks unchanged by time.

In real life, of course, it’s the other way around—a situation that poses problems when someone goes missing, years pass and the only existing photos don’t reflect the changes wrought by time.

Forensic artists can produce “aged” photos, but the process requires talent, training and patience.

Outdated images can also be a...

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