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Parkinsons epidemiology: prevalence is ( 0.5-1, 1-1.5, 1.5-2, 2-2.5 )% in the UK in >( 60, 50, 70, 80 )'s. it is the second most common neurodegenerative disorder after alzeheimers. the mean age of onset is ( 45-60, 50-65, 55-70, 60-75 ) but it can occur in people as young as ( 30, 20, 25, 35 ). there are ( 120,000, 100,000, 80,000, 140,000 ) people living with parkinsons in the UK.