As Matt said, we are never too old, but our feelings for things change.
I am more than twice your age and love rides and roller coasters but I have often commented on how different people are, both emotionally and physically. Our appreciation and need for things change. Some would never consider using the rides, me? I have never been interested in basketball. If we were all the same, there would be one heck of a queue for the ride we love. The demographics of society affects the type of people attending parks, I.e. The majority of youngsters are not in the type of employment from which there would be difficulty in having time off. Again for me in the past I worked shifts, so that helped.
Don't let your age control whether you ride or not, let your feelings decide that, and whatever you choose, enjoy it.