<p>Recent years have witnessed a rapid and widespread increase in the usage of online videoconferencing platforms (VCPs), e.g., Zoom, in part due to the COVID-19 pandemic. Older adults, the fastest-growing age group worldwide, are reported to have one of the most significant rates of increase in VCP usage compared to other user groups. To date, research on older adults and VCPs has mostly focused on understanding ways in which VCPs may help to mitigate social isolation and loneliness, and much less on the usability of VCPs among older users. To take steps towards addressing this research gap, this study examined whether, and to what extent, older users’ prior usage of a VCP is associated with improved task performance in other VCPs that share similarities in interface layout. Twenty older adults from Canada, New Zealand, the U.K., and the U.S. with experience using the Zoom platform participated in an online study between July 1st and October 1st 2021. In this study, participants completed nine tasks, as meeting participant and host, on three interfaces representing popular VCPs. Task completion time and likelihood were recorded for each platform. Findings suggest that similarity in VCP layouts benefits older adults’ task performance on certain platforms. However, degraded task completion likelihood and increased task completion times were observed when older users encountered tasks that were dissimilar from those for which they had familiarity. Our preliminary study findings may offer insights that could help inform the design of VCPs to enhance their usability for older adult users.</p>