I am 59 & love cruising. I presume you are in the UK like me
I have just booked for November to cruise from Genoa to Cape Town. This cruise is on a good pricewith nil or little single supplement. It is on MSC Sinfonia. I am travelling alone but told a friend who i met on my last cruise about it & she has booked also.
Take a look, I think you will find that on MSC cruises, because they offer such good deals for singles, there is always someone to talk to & make friends.
I am quite comfortable travelling alone but really begrudge the heavy single supps