From News.com.au: 

Man lives to 100, wins bet

A MAN who bet £100 ($240) a decade ago that he would live to be 100 is preparing to pick up his £25,000 ($60,000) winnings.

So confident was bookmaker William Hill in 1997 that it gladly offered Alec Holden odds of 250/1.

But the retired engineer, born April 24, 1907, celebrates his century - to the bookies’ dismay.

Mr Holden, from Epsom in Surrey, joked: “I’ve been very careful about what I’ve been doing in recent months. If I saw any hooded groups from William Hill standing in the street, I avoided them.”

Mr Holden, who has two sons aged 70 and 60, puts his longevity down to porridge for breakfast and “remembering to keep breathing”.

… 

He also plays chess every day, running a local club, he said.

(more here)

So the trick to a long life is to remember to keep breathing, play games (chess) every day, and to eat your porridge for breakfast.

I think I can do that, I just need to add the porridge.  Is that the same thing as oatmeal?