Of those who have a first stroke, within 5 years: 13% of men and 22% of women ages 40-69 have a recurrent stroke; and 23% of men and 28% of women 70 years and older have a recurrent stroke.
Rosamond W, Flegal K, Furie K, Go A, et al. Heart Disease and Stroke Statistics- 2008 Update. Circulation. 2008; 117. http://circ.ahajournals.org/cgi/content/short/117/4/e25