Hello David,
Concure with everything that is said above.
Just look on it that you are as young as you feel. ( I have never felt that I am 62 and am just going on 45 )
Have you had longings to see a part of the world? If so go for it !! Just You has many destinations to pick from from the start they will look after you from day one when you book. There is always a tour manager on each holiday and as stated before a wide range of fellow travellers ( discoverers I like to think of us as) of all ages doing exactly what you want to do. If you want to be by yourself and do your own thing on one day, OK, another day you might wish to be with a group and visit this and that or chill out at the pool or bar. Its all up to You.
Enjoy!!!! I am off in 3 weeks to the other side of the world and looking forward to it, no end. Yes I might be a bit reserved but still excited about the forthcoming adventure.
Good luck David and enjoy.
Best wishes
Eric