Society is fascinated with health, fitness and longevity. This obsession has spawned a multi-million pound industry centred around pushing the latest cutting-edge science, lifestyle modifications and products that claim to prevent ageing and live as long as possible.

But the secret to a long life doesn’t have to be so complicated. There are many simple things everyone can do to slow down time and feel younger.

When we talk about age, we aren’t always talking about how many candles are on your birthday cake. We actually have two different ages.

The first is of course chronological age. This is the number of years you’ve been alive.

But we also have a “biological age.” This is sometimes referred to as “true age” or “internal body age.” This refers to how well all of the body’s internal systems are functioning by looking for signs of ageing in the cells, blood and DNA.

Research indicates that a person’s biological age, rather than their chronological age, is related to how long they live. Let’s say you looked at two 60-year-old people. The person whose biological age is younger would be more likely to outlive the person who had a higher biological age.

There are now many ways to measure your biological age with epigenetic testing, which only requires a little bit of spit...

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