No, 60 is not too old for mountain biking. In fact, many people find that they enjoy mountain biking even more as they get older. There are a few things to keep in mind, however, if you are over 60 and thinking about taking up mountain biking. First, it is important to make sure that you have a bike that is the right size and fit for you. You also want to be sure to start off slowly and build up your endurance gradually. And finally, it is always a good idea to check with your doctor before starting any new exercise program. But if you take these precautions, there is no reason why you can’t enjoy mountain biking at any age.