How do we want to age? And how much control will we have over the process? Noelle McCarthy visits the Dunedin Study, and finds out why the most accurate measure of your age might not necessarily be your birthday.

Noelle McCarthy finds out her biological age: watch the video here

Video filmed and edited by Diego Opatowski.

How do we want to age? And how much control will we have over the process? Noelle McCarthy visits the Dunedin Study, and finds out why the most accurate measure of your age might not necessarily be your birthday.

Potentially, we all have control over how we age.

Genetics plays a part, but there are other important factors: whether you get enough sleep, what you eat and how much exercise you do.

The Dunedin Study has been tracking everyone born between April 1, 1972 and March 31,1973 at the city's Queen Mary Maternity Hospital. When the 954 subjects were aged 38, they tested them all to find out their biological age.

Biological age was calculated based on 18 measurements, including blood sugar and cholesterol levels, lung function, blood pressure, dental health, body mass index, waist circumference. The researchers also looked at chromosomes, measuring the length of protective caps called telomeres - because shorter telomeres are associated with ageing.

The study found that individuals who were ageing more rapidly were less physically able, showed cognitive decline and brain ageing, self-reported worse health and looked older.

Measured biological ageing in young adults can be used to identify causes of ageing and be used to evaluate therapies to slow the ageing process, the researchers say.

"We've all got options, strategies we can bring to bear that will make things better or longer," says Professor Richie Poulton, who directs the study.

"Nothing is deterministic - it's not written in stone, and the faster we can get away from that deterministic thinking about it being written in stone, the better."

Go to this episode on rnz.co.nz for more details