Talking about surveys, I don't know the situation of retired people (I don't know if a retired is considered by companies a good or bad target to complete their surveys) because none of my friends that work online is retired. But supposing a retired receives at least a discreet amount of pension, maybe he/she can earn about 5 dollars per month. If the retired is used to regular travels, especially by flights, maybe there is the possibility to earn well with surveys, but I'm not sure. I may suppose the retired, in such a case, should live in a top tier country to earn well with surveys.