How long do you have to make a difference in the world?

From high school until you retire.

When you're born until you die.

From the time you are 15 until you die.

When you graduate high school until you retire.

The timeframe for making a difference in the world can vary greatly depending on individual circumstances and choices. It is not limited to a specific age range or a predetermined period. People can make a difference at any stage of their lives and continue to do so as long as they are motivated and committed to creating positive change.