Attempts to explore the mix between the provision of support by informal and formal sources typically involve evaluations of a single sample of seniors. This study examined the sources of support (i.e. informal, formal, mixed) for instrumental activities of daily living (IADL) received by seniors at two points in time, approximately 12 years apart. Sources of support were compared to consider whether those used by men and women in 1983 (n = 1479), were similar to those used by their counterparts more than a decade earlier (n = 2512). For women, the proportions receiving assistance from various sources were identical in 1983 and 1971. For men, they were not. Among seniors receiving some IADL assistance, the probability of receiving it from primarily informal sources in 1983, relative to 1971 was significantly lower for men than for women. Moreover, the probability of receiving support from primarily formal sources in 1983, relative to 1971 was significantly higher for men. These findings might imply that, for men, but not for women, the receipt of support has moved toward primarily formal sources and away from primarily informal sources. Several potential explanations for these findings are explored.