Yes, two people who leave Earth at different times and travel for an extended period can experience different amounts of time dilation when they return home.
Time dilation occurs due to the effects of relative motion and gravity on the flow of time. According to Einstein's theory of relativity, time appears to pass slower for an object or observer in motion relative to another object or observer at rest.
If two people leave Earth at different times and travel at significant speeds or experience different gravitational fields during their journeys, they will experience different amounts of time dilation compared to an observer who remains on Earth.
For example, if one person leaves Earth and travels at a high velocity near the speed of light for many years and then returns, they will experience time passing more slowly compared to the person who remained on Earth. As a result, when the traveler returns, they may find that more time has passed on Earth than they have experienced during their journey.
Similarly, if one person leaves Earth and enters a region with a stronger gravitational field, such as near a massive object like a black hole, they will also experience time passing more slowly compared to the person who stayed on Earth. When they return, they may find that more time has passed on Earth than they have experienced.
It's important to note that the difference in time dilation will depend on the specifics of each individual's journey, including their speed, trajectory, and exposure to gravity. These factors can influence the amount of time dilation experienced by each person.