Don't worry of getting OLD. Eventually you will.

1. but do worry of not learning any thing day after day,
2. worry if you never thought of environment care anymore,
3. if you are worring all the time BUT felt nothing can be done, try stop worrying, accept the situation for time being BUT do not stop to try to change.
4. if you can't stop worrying all the time, then think about that you are worrying TOO MUCH and you never understand where is the limit OR you never compare your self to others less fortunate.
5. after all we need to find a balance point so that what we worry is helping us to stay coutious and for GOOD eventually.