  We present results of a replication study on smartwatch visualizations with
adults aged 65 and older. The older adult population is rising globally,
coinciding with their increasing interest in using small wearable devices, such
as smartwatches, to track and view data. Smartwatches, however, pose challenges
to this population: fonts and visualizations are often small and meant to be
seen at a glance. How concise design on smartwatches interacts with
aging-related changes in perception and cognition, however, is not well
understood. We replicate a study that investigated how visualization type and
number of data points affect glanceable perception. We observe strong evidence
of differences for participants aged 75 and older, sparking interesting
questions regarding the study of visualization and older adults. We discuss
first steps toward better understanding and supporting an older population of
smartwatch wearers and reflect on our experiences working with this population.
Supplementary materials are available at https://osf.io/7x4hq/.
