This is an incomplete thought as it does not have a subject.
Answer:
When your older or later on down the road in your life
Explanation:
The phrase "later in life" means that down the road something will happen or your waiting for something to happen.
A hunter named Eckels pays $10,000 to travel with Time Safari, a time machine company that takes hunters back to the time of dinosaurs and allows them to hunt Tyrannosaurus Rex.
It is the main idea of your concept... It's the thing that you try to explain