"There is a booming market in tests of biological age.. Partly they are for people who want to study ageing. Mainly they are for curious consumers."

"Perhaps the most famous adherent is Bryan Johnson, a 46-year-old tech entrepreneur with the sheeny face of a shop mannequin, who is spending millions to reverse his ageing clock to 18....  GlycanAge looks at a process known as glycosylation... Studies of population levels have shown an association between glycosylation patterns and disease ― often before other signs of illness appear.... On its website, GlycanAge identifies this as a root cause of ageing.... The test was just meant to be a bit of fun. In the days after receiving it, I oscillate between dismissing it and thinking I’m an idiot for dismissing it...."

I'm reading "What’s your biological age? We had a shock when we found out ours/What happened when the Times science editor Tom Whipple and two of his colleagues, James Marriott and Robert Crampton, took the ultimate age test (price, £289)?" (London Times).

Whipple is 42 and was told his "biological age" is 71.

He goes to a regular doctor who administers various tests and says, “You don’t seem to be 71.”

I just ran into this article while scanning the London Times, but I'm realizing that Bryan Johnson is the guy in a Tucker Carlson interview that Meade was nudging me to watch.