By age group, among men, prevalence of lifetime abstention was stable between 1997 and 2014 in all age groups except the oldest where it decreased steadily, on average, 1.3% per year (AAPC p=0.02). There were no in-between changes in direction of trends except in the youngest age group (60–64) which had a decrease of, on average, 6.5% per year for 8 years starting in 2003 (APC p=0.003) followed by an increase of, on average, 16.2% per year between 2011 and 2014 (APC p=0.04). Among women, prevalence of lifetime abstention decreased between 1997 and 2014 within each age group.
