According to Leafscience, a life extension advocacy foundation, the thymus is one of the most important organs in the body, and potentially a suitable target for therapies that seek to extend the human health-span:

it is where thymocytes produced in the bone marrow travel to become new T cells before being trained in the lymph nodes to become the defenders of the adaptive immune system. However, as we get older, the thymus increasingly turns to fat and starts to shrink, causing its ability to produce new T cells to fall dramatically. This process is known as thymic involution and actually begins shortly after puberty, so this is one aspect of aging that begins fairly early in life, although it is many decades later before its decline causes serious health issues.

In the year ending in November 2nd, 2020, will a new in vivo study on regenerating or rejuvenating the human thymus be started?

Resolution

This question resolves positively if between November 2nd 2019 and November 2nd 2020, it is credibly disclosed that a new in vivo study on regeneration or rejuvenating the human thymus has been started after November 2nd 2019. Credible disclosure may be via reporting in scientific (pre-print) articles, or registration in a clinical trial database.