Increased incidence of ischemic stroke in young: A population-based stroke registry study from 2008 to 2018

•In the population-based Brest Stroke Registry, ischemic stroke incidence increased over a 10-year studied period, in young adults under 60-year-old.•Intracerebral hemorrhage incidence decreased in young adults during the same period.•Under 60 most ischemic stroke were minor strokes.•Diagnostic work-up improved across time although ischemic stroke mechanisms remained stable.•Vascular traditional risk factors remained stable across time in patients under 60-year-old.•For stroke mechanisms subtype, in young adults under 60-year-old, while cryptogenic strokes predominate, SSS-TOAST classification reduced the rate of cryptogenic strokes.