The below refers to family caregivers/unpaid caregivers as informal caregivers:

Studies have reported informal caregivers to be primarily women (Brinda et al., 2014; Prince & The 10/66 Dementia Research Group, 2004; Shaji et al., 2003). A study examining family members’ experiences with caregiving of people with dementia in Karnataka (Narayan et al., 2015) found that two-thirds of the caregivers interviewed to be women and the mean age of all caregivers was reported as 51.3 years. With respect to average time spent on care, a study conducted in Tamil Nadu reported that caregivers of older adults spent an average of 38.6 hours per week on care (Brinda et al., 2014).

References:

Brinda, E. M., Rajkumar, A. P., Enemark, U., Attermann, J., & Jacob, K. (2014). Cost and burdenof informal caregiving of dependent older people in a rural Indian community. BMC Health Services Research, 14(1), 207. https://doi.org/10.1186/1472-6963-14-207

Narayan, S. M., Varghese, M., Hepburn, K., Lewis, M., Paul, I., & Bhimani, R. (2015). Caregiving experiences of family members of persons with dementia in south India. American Journal of Alzheimer’s Disease & Other Dementias®, 30(5), 508-516. https://doi.org/10.1177/1533317514567125

Prince, M., & 10/66 Dementia Research Group. (2004). Care arrangements for people with dementia in developing countries. International Journal of Geriatric Psychiatry, 19(2), 170–177. https://doi.org/10.1002/gps.1046

Shaji, K. S., Smitha, K., Lal, K. P., Prince, M. J. (2003). Caregivers of people with Alzheimer’s disease: a qualitative study from the Indian 10/66 Dementia Research Network. International Journal of Geriatric Psychiatry, 18(1), 1–6.