Childhood has zero worries when

In childhood we have worries about school , pressure of parents etc . But yeah not about the things you have mentioned .

see yourself coming closer to your end.

Death is inevitable and even childs do die. Reminder of end is good in terms of making good deeds.

In childhood, you are free to do a lot of things with no serious consequences attached to them

In India we have juvenile justice court , if a child cmirs some serious crime he is sent to juvenile rehab centre to mend his habits and council him without punishment.

Good luck