 Researchers think that restoring the thymus back to its youthful glory may be very important for preserving our health later in life. That's precisely what a group of researchers set out to do in a small trial between 2015 and 2017. However, what they did seems to have done more than just regenerating the thymus. It appears to have partly rejuvenated nine lucky guys. The trial was called Trim. The biological age of Trim patients was measured using four different epigenetic clocks at different points during the treatment and after its conclusion. All four clocks showed similar reductions in biological age, meaning that the patients were getting biologically younger.