Fig. 1.

Study design. Birth cohorts born between 1935 and 1956 are illustrated from 1988 to 2017. Individuals were followed from when they turned 60 years until death, emigration, dementia diagnosis, or end of follow-up in 2017. Migraine diagnoses were registered from 1988 onwards. This figure illustrates the life course of a single individual from 6 of the 21 included birth cohorts exemplifying individuals turning 60 years and being followed in registers until endpoints