An 80 year old from the Tsimane (pronounced chee-MAH-nay) group had the same vascular age as an American in their mid-fifties, suggests a new report. The Tsimane people — a forager-horticulturalist population of the Bolivian Amazon — have the lowest reported levels of vascular aging for any population, with coronary atherosclerosis (hardening of the arteries) being five times less common than in the US, the research shows.