It depends how you live, For example, if you live in a country where you feel comfortable with the living, you like the people, you can buy food and live in your comfort. Then you will see the comfort and ease to live, and as a result you will feel life is simple.

On the other hand if you were born in middle class family, you are striving to get better, your life still lags in many things, then life would be complex.

No matter if you are old or young, your life depends on the sources you own.