Longitudinal studies on dementia identified the following as risk factors: advanced age (Nitrini et al., 2004) and years of education (Chaves et al., 2009).

References:

Chaves, M. L., Camozzato, A. L., Godinho, C., Piazenski, I., & Kaye, J. (2009). Incidence of Mild Cognitive Impairment and Alzheimer Disease in Southern Brazil. Journal of Geriatric Psychiatry and Neurology, 22(3), 181–187. https://doi.org/10.1177/0891988709332942

Nitrini, R., Caramelli, P., Herrera, E., Bahia, V. S., Caixeta, L. F., Radanovic, M., Anghinah, R., Charchat-Fichman, H., Porto, C. S., Carthery, M. T., Hartmann, A. P. J., Huang, N., Smid, J., Lima, E. P., Takada, L. T., & Takahashi, D. Y. (2004). Incidence of dementia in a community-dwelling Brazilian population. Alzheimer Disease and Associated Disorders, 18(4), 241–246.