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Question

Is it possible for a son or daughter to be biologically older than his or her parents? Explain.

Solution

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Explanation: As we know that the expression of the time dilation

\begin{aligned} t&=\frac{t_{0}}{\sqrt{1-\frac{v^{2}}{c^{2}} }} \\ \textbf{where,}\ c&=\text{speed of the light}\\ v&=\text{the velocity in between the observer}\\ &\text{and observed object}\\ t&=\text{time observed in other frames of reference}\\ t_{0}&=\text{time observed in observer's own frame of reference} \end{aligned}

If one of the twins travels at a near-light speed and returns, he will have aged less than the other. So, if the parents take a long trip in a spaceship that travels faster than the speed of light in vacuum, their son or daughter will be biologically older than them when they return, according to the time dilation expression.

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