A 2019 study conducted by the University of Western Australia Medical School has discovered a link between men with higher levels of the sex hormone estradiol, a hormone produced by testosterone, and slower aging. This study is the largest of its kind to investigate the relationship between hormones and aging in older men.

http://www.news.uwa.edu.au/2019013011200/could-higher-levels-testosterone-hold-key-slower-ageing