There are a lot of young bowlers on this sight. And I have to warn you that there will indeed be a time when you can no longer perform to the maximum you have set in your mind or what your mind has experienced in the past. The idea of NEVER stop improving is just ignorant, unless you are discounting actual score as your criteria for improvement.
I think as we get older, our goals have to be adjusted for that age. Most people cannot keep up execution and performance after say...50 years old. I know if you are reading this and you are 23 it doesn't really mean much to you. But you will be there one day.
There has to be the three Ds Desire, Dedication and Determination. If you do not have those for whatever reason, then you will not improve. If you have family and cannot make time for lessons and practice....you will not improve. If you have budget limitations and are putting that cash in the gas tank, then you cannot improve because you cannot afford lessons and practice or the gas to and from the center. If you are experiencing life changes job change, divorce, death of a relative, moving. You know those kinds of things...you will not get better at that period in your life.
But being at a peak, doesn't mean that you can no longer enjoy the sport. I think your mental goals have to be adjusted and learn to love other aspects of the sport rather then score. There's no guarantee in life that you put X amount of effort, Y amount of money and you will equal a 200+ bowler. Simply put, not everyone can be a 200+ average bowler no matter how much time and money are dumped into the effort. There was never that guarantee when you walk into a center. So in leu of that, you have to find other aspects that you enjoy and keep you in the sport.
Erin