Some of the common conditions that have been found to accelerate the ageing process and affect longevity in developing countries are early exposure to adverse conditions such as poverty, malnutrition, prenatal stress, and infectious diseases (Kalaria et al., 2008). Poverty, low literacy and lower socioeconomic status have been found to be closely linked and further associated with poor access to health care and thus an increased risk of cognitive impairment (Sengupta et al., 2014).

References:

Kalaria, R. N., Maestre, G. E., Arizaga, R., Friedland, R. P., Galasko, D., Hall, K., … & Prince, M. (2008). Alzheimer’s disease and vascular dementia in developing countries: prevalence, management, and risk factors. The Lancet Neurology, 7(9), 812-826. https://doi.org/10.1016/S1474-4422(08)70169-8

Sengupta, P., Benjamin, A. I., Singh, Y., & Grover, A. (2014). Prevalence and correlates of cognitive impairment in a north Indian elderly population. WHO South-East Asia journal of public health, 3(2), 135-143. https://doi.org/10.4103/2224-3151.206729