I believe senior citizens prefer tea gardens and patissieres (pastahane in Turkish) to cafes. It's also not uncommon to notice senior citizens hanging out in small city parks especially during summer. Many guys still frequent kiraathane or kahvehanes where they often come to chat with friends, play cards, okey (Turkish version of Mahjong) or backgammon. These are shops with almost no appeal to female clientele.
In old neighborhoods like Moda, Cengelkoy, Anadolu Hisari, Cicekci on the Asian side and Kurtulus, Arnavutkoy, Fener on the European side, especially senior citizens carry on the tradition of hanging out at, around local stores (either the local "bakkal" - traditional style conveniency store- or the barbershop). You may run into groups of 4-5 chatting inside a store, sipping their teas eventhough they have no intention to buy anything. These locals stores often function as meeting points for the neighbors.