At 46 Bryan Johnson feels old and is spending millions to fight that back

Tech entrepreneur Bryan Johnson, 46, is spending millions trying to turn back time on his body. His extreme and sometimes controversial regime of fitness, tracking, and treatments has raised a lot of eyebrows after his story went viral last year.

BBC Click’s Lara Lewington has returned a year on to find out about the latest experiments he has been trialling.

Your Gray Matters' view: we welcome Bryan's spending millions in testing new technologies that will fight back aging, ultimately benefiting all of us.