There are several single senior travel clubs, including Connecting: Solo Travel Network (CSTN) and Singles Travel International. However, It's best to research each offering before booking as not all trips are exclusive to seniors.
Connecting: Solo Travel Network (CSTN) is a Canadian non-profit organization that helps singles access trips to locations all over the globe. There is a membership fee. Instead of offering trips, CSTN searches tours and trips from many destinations and makes members aware of these opportunities. Singles Travel International offers cruises for people over 50. They offer many options, including cruises to Alaska, the Caribbean and Australia. It's vital to read the description of each trip carefully to make sure it fits one's needs as a single and a senior.