Scientists are trying to solve a question which some spend thousands trying to achieve - the secret of growing old gracefully.
Experts at The Sanger Institute in Cambridge have been looking at DNA changes in identical twins.
By comparing the siblings they found certain age genes that are switched on or off by environmental and lifestyle factors.
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The Met Office has issued a yellow cold weather alert and there's the risk of snow in places later on Boxing Day.
Mostly dry and bright, but chilly. Frost tonight.
Most places will see bright or sunny spells through the day, but with a few showers around, especially during the morning.