How to identify the age of a “living” person?

How to identify the age of a “living” person?

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An Indian old man claims he is [180 years old] now.

We are not able to tell he is 180 or 181 probably. But can we tell he is 90, 120, 100 or 150?

Different people may age differently.
A 60-year old person may appear to be 80, while somebody else could appear younger than their mathematical age. Some other people may have progeria.

What is the most accurate way to identify a living person's age nowadays? Are there reliable parameters to measure?

C-14 needs a long time base line. Hence, it is suitable for the bone of dead people.

What kind of method can guarantee it can distinguish a 30y and a 80y old person? What's the error bar of that method?

The most accurate method known so far may be Horvath's methylation dating algorithm, which uses 353 CpG sites (Genome Biology research article, Nature news article).

From the Nature article, this method was validated with at least one population.

[After the publication in Genome Biology] Marco Boks at the University Medical Centre Utrecht in the Netherlands applied [the algorithm] to blood samples collected from 96 Dutch veterans of the war in Afghanistan aged between 18 and 53. The correlation between predicted and actual ages was 99.7%, with a median error measured in months.

However, I did not read the original research article and it seems that the dating method works poorly on cancer patients.

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