A Harvard Medical School study (published recently in JAMA) found that older individuals got sicker than insured people in a comparable age group. Additionally, the differences in health were quickly reduced when the uninsured individuals became eligible for Medicare at age 65. The study also found that previously insured participants experienced no significant change in their health as they transitioned to Medicare, while participants who previously had little or no prior coverage experienced a significant slowing of the decline of their health once on Medicare.