develop, promote and ensure widespread access to regenerative medicine solutions to the disabilities and diseases of aging," focusing on the strategies for engineered negligible senescence. Before March 2009, the SENS research program was mainly pursued by the Methuselah Foundation, co-founded by de Grey. A major activity of the Methuselah Foundation is the Methuselah Mouse Prize, a prize designed to incentivize research into effective life extension interventions by awarding monetary prizes to researchers who stretch the lifespan of mice to unprecedented lengths. De Grey stated in March 2005 "if we are to bring about real regenerative therapies that will benefit not just future generations, but those of us who are alive today, we must encourage scientists to work on the problem of aging." The prize reached 4.2 USD million in February 2007. In 2007, de Grey wrote the book Ending Aging with the assistance of Michael Rae. In a 2008 broadcast on Franco-German TV network Arte, de Grey claimed that the first human to live 1,000 years was probably already alive, and might even be between 50 and 60 years old already. In 2012, de Grey inherited a considerable fortune of more than , of which he donated to the SENS Research Foundation. In 2022, de Grey started a new foundation and announced this at the Longevity Summit in Dublin. The board of directors include Greg Grinberg as Executive Chair, Daria Khaltourina, Martin O’Dea (also Events Director), Gennady Stolyarov and David Wood. Mathematics On 8 April 2018, de Grey posted a paper to arXiv explicitly constructing a unit-distance graph in the plane that cannot be colored with fewer than five colors, increasing the previously known lower bound by one. The previous lower bound of four was due to the problem's original proposal in 1950 by Hugo Hadwiger and Edward Nelson. De Grey's graph has 1581 vertices, but it has since been reduced to 510 vertices by independent researchers. AgeX Therapeutics De Grey was formerly Vice President of New Technology Discovery at AgeX Therapeutics, a startup in the longevity space helmed by Michael D. West, PhD. De Grey was appointed to the position within the company in July 2017. Personal views Outlook on the future of anti-aging medicine Aubrey de Grey coined the term Methuselarity, which he defines as the moment when medical therapies will rejuvenate people enough to continue living healthily until the next improved generation of rejuvenation biotechnology, and so