The research team found no statistically significant difference in stroke incidence between those who took aspirin and those on the placebo. While a relatively small overall number of brain bleeds occurred in participants during the study period — 187 total, with 108 from the aspirin group and 79 from the placebo one — bleeding events were 38% higher among participants who were taking aspirin daily, regardless of their gender, age, or cardiovascular risk. Bleeding into the brain or onto its surface are common and serious results of fall-related head injuries in older adults. In this study, nearly half of these bleeding events were due to trauma.

Read more in this article from the NIH, Daily low-dose aspirin has little impact on stroke risk and spikes risk of brain bleeding from falls.