Your biological age is the number of days you’ve lived.
Your psychological age is the number of thoughts you’ve entertained.
Your sociological age is the number of contributions you’ve made.
The Process:
1. Decide what you want to achieve.
2. Try different ways of achieving it until you find one that works for you.
3. Do more of what works. Do less of what doesn’t.
4. Don’t stop doing it until it stops working.
5. Repeat.
It is both this simple and this hard.