You don't have to stop traveling just because you're getting older. If anything, it's when you are older that travel means more; a lifetime of knowledge allows you to fully appreciate the new experiences you're having. And, if not for travel, what did you work so hard for all those years?
But being older does often mean that you can't travel the way you used to. We're not talking about upgrading from a hostel to a proper hotel. What we're referring to are physical limitations you might need to work around, as well as the fact that as an older individual you've suddenly become numero uno on a thief's hit list.