Scientists around the world are chasing a way to slow or reverse aging, and this DW film follows the labs closest to an answer. It starts on Costa Rica's Nicoya Peninsula, a so-called Blue Zone where demographer Luis Rosero-Bixby documented an unusual concentration of centenarians, then turns to Madrid, where Maria Blasco studies telomeres, the DNA caps that shorten with age, and Manuel Serrano investigates senescent "zombie cells" that flood the aging body with inflammatory signals. Steve Horvath's epigenetic clock, a lab test that measures biological rather than chronological age, gives the film a way to judge which interventions actually work. Money moves fast through this research: bio-startups in Hong Kong, a $250 million bet by Alex Zhavoronkov's company, and a wider industry racing to patent the first anti-aging pill. The film weighs genuine breakthroughs against products rushed to market on thin evidence, following researchers, entrepreneurs, and the very old people whose bodies are the field's most valuable data.