This study investigates the relationship between health and marital st
atus, focusing particularly on older persons, using data on reported l
ong-term illness rates from the Samples of Anonymised Records (SARs) d
rawn from the British Census. Until about age 70, long-term illness ra
tes are generally lowest for those in first marriage, followed by the
remarried, with intermediate values for the widowed and divorced, and
highest for the single. Beyond age 75 for both sexes, single people in
the private household population report the lowest illness rates, but
when the institutionalized population is included single people at ol
der ages no longer appear to be the healthiest group. This is because
at older ages increasingly high proportions of those with long-term il
lness are in institutions, disproportionately so for single people, ex
plaining why such cross-overs have been found in analyses of private h
ousehold populations. The health status of co-habiters is generally cl
oser to the married than to other groups for both sexes.