Decreases in cerebral microvasculature with age are associated with the decline in growth hormone and insulin-like growth factor 1.
Sonntag WE, Lynch CD, Cooney PT, Hutchins PM. Decreases in cerebral microvasculature with age are associated with the decline in growth hormone and insulin-like growth factor 1. Endocrinology. 1997 Aug; 138(8):3515-20.