At relativistic speeds, Mars and Earth are ludicrously close - between 4 and 20 minutes apart at light speed. So even travelling arbitrarily close to the speed

At relativistic speeds, Mars and Earth are ludicrously close - between 4 and 20 minutes apart at light speed. So even travelling arbitrarily close to the speed of light, at the greatest possible distance, you could only gain 20 minutes on the folks back home per trip. A round trip weekly at average distance (just going with 12mins/trip because the details get complicated), 48 weeks a year for 40 years would leave you just over a month younger than those who stay put.