Researchers from the U.K. and Canada identified early life risk factors from a 1958 birth cohort that predicted suicide up to 50 years later. The strongest factors for suicide were birth order (later-born children more at risk), young maternal age, emotional adversities (such as parental death, neglect, domestic tension, institutional care, and parental divorce/separation and bullying. The strongest link was for persons with three or more adversities.
Geoffroy, M., Gunnell, D., Power, C.; Prenatal and childhood antecedents of suicide: 50-year follow-up of the 1958 British Birth Cohort Study. Psychological Medicine. April, 2014. 44(6); 1245-1256. DOI: http://dx.doi.org/10.1017/S003329171300189X