None of us can stop time, all of us get older. The best you can do is set goals and try different things, find things you enjoy and make opportunities to keep learning.
You have to come to terms with the passing of time and focus more on setting reasonable goals and work towards these goals gradually. Try your best to find ways to enjoy your life from day to day thinking about what you CAN do. Otherwise you wont have enough energy to enjoy being 25 because your too worried about being 30 and so on.

Open Eyes