Hello Yeeng Lih Lee,
"Who is the better demographic to target in my ads? Retired persons ... or homemakers?"
I think it's a better choice housewives. Among housewives have more young people willing to work and contribute to the household budget. I would not have retired omitted. Their experience can be of use in the business. I wish you a successful advertising. I apologize for spelling mistakes, my English is very bad, I hope you understand. Thank you