Stroke incidence by age
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Stroke Incidence by Age: Key Trends and Patterns
Age-Related Increase in Stroke Incidence
Stroke incidence rises sharply with age. Studies consistently show that the risk of stroke increases exponentially as people get older, with the highest rates seen in those over 75 years old. For example, in a large Dutch cohort, stroke incidence was much higher in older adults compared to younger ones, and the increase with age was nearly exponential 17. Similarly, global projections indicate that older age groups, especially those aged 75 to 79, are at the highest risk for stroke .
Trends in Young Adults and Adolescents
Recent research highlights a concerning trend: while overall stroke incidence is declining in older adults, it is rising or remaining stable in younger populations. Multiple studies from different countries and regions have found that stroke incidence among people under 55 years old has increased over the past two decades 2345+1 MORE. For instance, the proportion of strokes occurring in people under 55 rose from 12.9% to 18.6% over a decade in one US study . Globally, the incidence of ischemic stroke in adolescents and young adults (ages 15–39) has shown an upward trend since 2010, especially among those aged 30–39 .
Diverging Trends: Younger vs. Older Adults
There is a clear divergence in stroke trends by age. While stroke incidence has decreased significantly in people aged 55 and older, it has increased in those under 55 4510. This pattern is seen in both high-income and some low- and middle-income countries. The increase in young adults is observed for both men and women and across different stroke subtypes, though the rise is most pronounced for ischemic strokes 135.
Sex and Ethnic Differences in Age-Specific Incidence
Women under 45 years old have a higher incidence of stroke than men in the same age group, but this difference lessens with age 13. Ethnic disparities are also evident: in some populations, younger black adults have not seen the same decline in stroke incidence as older or white adults, and in some cases, incidence has increased .
Stroke Subtypes and Age
The type of stroke also varies with age. In younger adults, a higher proportion of strokes are due to intracerebral hemorrhage, but as age increases, ischemic strokes become more common 13. The incidence of intracerebral hemorrhage tends to remain stable or decrease, while ischemic stroke incidence is rising in younger groups 135.
Seasonal and Socioeconomic Patterns
Seasonal patterns in stroke incidence differ by age. Younger adults tend to have a summertime peak in stroke incidence, while older adults experience a winter peak . Socioeconomic status also plays a role, with the fastest increases in stroke incidence among young adults occurring in regions with lower socioeconomic development 379.
Conclusion
Stroke incidence increases with age, peaking in the oldest age groups. However, while older adults have seen a decline in stroke rates over recent decades, younger adults and adolescents are experiencing stable or rising incidence, particularly for ischemic strokes. These trends are consistent across different regions, sexes, and ethnic groups, highlighting the need for targeted prevention and monitoring strategies for younger populations as well as continued efforts in older age groups 1234+5 MORE.
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