'I'm a 101-year-old doctor and this is the secret to staying sharp as you age'
Dr Tucker shared his tips for a long life
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Diet, lifestyle and genetics all play a part in the ageing process.
A 101-year-old practicing doctor explained the extra things he does to stay sharp as possible.
The number one rule Dr Howard Tucker - who has been practising medicine since 1947 - shared is to keep working.
He explained there are links between retirement and cognitive decline, but working as a doctor needs him to continually use his brain.
He said continuing to work can keep the brain sharp
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"My job requires me to review a number of medical subjects and think through problems," he said.
"Staying up to date with the latest advancements in neurology keeps my brain busy."
Dr Tucker added people can keep their brains sharp as they age by taking up a new hobby, learning a skill or volunteering.
Other things the expert does to stay young is to maintain a social life.
Dr Tucker added he will make an effort to have dinner with his wife and people in their community.
He will try new restaurants and meet with friends and colleagues often.
Some studies have shown strong relationships can help maintain memory and cognitivite fuctions, the expert explained.
As well as keeping up-to-date with the latest medical news, the doctor said he will read for fun.
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The doctor recommended continuing to read and spending time with others
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"Immersing yourself in a good book, fiction or non-fiction, requires your brain to process a bulk of new information," the neurologist wrote for CNBC.
"I believe this is key to keeping your mind sharp."
This comes as experts shared the eight healthy lifestyle habits that can slow the ageing process by six years.
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