In a mere psychological way we cannot change anything in our youth while through esoteric paths we can make a great peace with struggles (even serious) that follow us during life. The so called "cycles".
So yes, 99% of people is not aware of how much power we really have, BUT the great thing is that we are never too old to start deep changes in our lives!
Never too old to change and never too old to revisit the errors and have a deep conversation with ourselves, perhaps healing wounds of the past.