World’s Oldest Cat Millie Turns 31
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The world’s oldest verified cat, Millie, has reached the age of 31, according to records maintained by the Guinness World Records. The English cat, owned by Leslie Greenhough of the UK, celebrated her milestone birthday in August 2026, with her diet and lifestyle drawing attention from animal care experts. Greenhough, who has documented Millie’s life since her adoption in 1995, described her as “a remarkable example of feline longevity.”
Millie’s age surpasses the previous record held by a cat named Creme Puff, who lived 38 years but was not officially verified by Guinness World Records. The organization confirms that Millie’s age is supported by veterinary documentation and owner-provided birth records. Greenhough stated that Millie’s longevity is attributed to a strict regimen of spring water, a balanced diet, and regular health checkups. “She drinks only spring water, which we believe helps her kidney function,” Greenhough said.
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Veterinarians specializing in geriatric animal care noted that cats typically live 12 to 15 years, with exceptional cases reaching 20 years. Dr. Emily Carter, a feline health expert at the Royal Veterinary College, explained that Millie’s age is “statistically improbable” without consistent medical oversight. “Cats over 25 are considered centenarians in feline terms,” Carter said. “Millie’s case highlights the importance of diet, environment, and preventive care in extending lifespan.”
Greenhough emphasized that Millie’s routine includes daily exercise, mental stimulation through puzzle toys, and a diet of high-quality wet food. “We avoid commercial kibble, which can contribute to dehydration,” he added. Veterinary records reviewed by News Directory 3 confirm that Millie has no diagnosed chronic conditions, though she receives periodic blood tests to monitor her health.
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The claim has sparked interest in the science of animal aging. Researchers at the University of Edinburgh’s Institute of Genetics and Development are studying Millie’s genetic profile to identify potential factors contributing to her longevity. “We’re analyzing her telomere length and metabolic markers,” said Dr. Raj Patel, a lead researcher. “If we find unique genetic traits, it could inform new approaches to aging in both animals and humans.”
Millie’s case also raises questions about the role of environmental factors in longevity. Greenhough noted that Millie lives in a low-stress household with minimal exposure to toxins. “We use natural cleaning products and avoid pesticides,” he said. This aligns with broader research on how reduced environmental stressors may impact lifespan.
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While Millie’s age is unprecedented, it is not the only record for feline longevity. In 2023, a cat named Shug in the US was recognized as the world’s oldest living cat at 26 years, according to the International Cat Association (TICA). However, TICA’s records are not universally accepted as official, unlike Guinness World Records.
The debate over verification underscores the challenges of tracking animal lifespans. Many claims rely on owner-provided documentation, which can be subject to inaccuracies. Guinness World Records requires “irrefutable evidence” of age, including veterinary records, photographs, and historical data. Millie’s case meets these criteria, according to the organization.
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Millie’s story has also resonated with pet owners worldwide. Social media platforms have seen increased discussions about feline care, with many users sharing tips for extending their pets’ lives. Greenhough noted a surge in inquiries about Millie’s routine. “People are curious about how we maintain her health,” he said. “It’s a reminder that pets can live longer with proper attention.”
The focus on Millie’s diet and lifestyle reflects broader trends in pet care. A 2025 study published in the Journal of Veterinary Science found that cats fed a wet-food diet had a 20% lower risk of kidney disease compared to those on dry food. While the study did not address longevity directly, it supports the dietary choices Greenhough has made for Millie.
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As Millie continues to thrive, her case remains a subject of scientific and public interest. Guinness World Records has not yet issued an official certificate for her age, but the organization acknowledges the strength of the evidence. “We are reviewing the documentation,” a spokesperson said. “If verified, it would be a historic milestone.”
For now, Greenhough remains focused on Millie’s well-being. “She’s our family,” he said. “We’re just grateful she’s here.” With her age defying expectations, Millie’s story continues to inspire both pet owners and researchers alike.