A major long-term study tracking adults for 37 yrs finds that regular physical activity in your 40s, 50s and beyond can cut dementia risk by up to 45 per cent, even in those with genetic vulnerabilityA major long-term study tracking adults for 37 yrs finds that regular physical activity in your 40s, 50s and beyond can cut dementia risk by up to 45 per cent, even in those with genetic vulnerability Latest News [ SOBAN NEWS: International and National ]