senior citizen getting old age security in Canada, if stay for more than six months out of Canada will not get old age security after six months. however, if they stay in Canada for 20 yrs or more , they are entitled for oas in India . my question is to get oas in India after 20 yrs of residency in canada..do i need to just inform service Canada about staying in India for more than six months for that particular time or there is some different procedure to avail that benefit. Also, once I start getting OAS in India, can i come back to Canada in normal way