Self improvement can begin at any age.
That path of self improvement should be adopted which can be verified by any third party audit.
Steps for improvement must be documented before and after an exercise for self improvement is done, in such a way that any third person can verify and audit it.
It means, self improvement must begin from our outer and verifiable behaviours. (and not from inner behaviours as some people suggest).
Inner steps are difficult to be verified by a third person. Without outsider’s watch on our steps, it is difficult to be consistent.