Longevity researchers compared the life expectancies of people in the US, Canada, Ireland, the UK, Australia, and New Zealand, over a period of three decades, and found that Australians outlive their American counterparts by four to five years. The Irish also fared well during the study period, seeing the “largest gains in life expectancy.” “Yes, we’re doing badly,” said senior author Jessica Ho, an associate professor of sociology and demography at Penn State. “But this study shows what we can aim for. We know these gains in life expectancy are actually achievable because other large countrie…