In a scenario where a 30-year-old astronaut travels to a star 40 light-years away at 0.90c, her son on Earth will age 90 years by the time she returns, making him 90 years old. The astronaut's age can be calculated using the time dilation formula, considering her travel time of approximately 88.89 years round trip. Due to relativistic effects, she will age significantly less than her son during this journey. The calculations indicate that while her son ages 90 years, the astronaut's age will be around 44.44 years, resulting in her being approximately 74 years old upon return. This highlights the profound impact of relativistic effects on aging during high-speed space travel.