Via ScienceDaily: researchers "have identified a group of 'aging' genes that are switched on and off by natural mechanisms called epigenetic factors, influencing the rate of healthy aging and potential longevity. The study also suggests these epigenetic processes - that can be caused by external factors such as diet, lifestyle and environment - are likely to be initiated from an early age and continue through a person's life. The researchers say that the epigenetic changes they have identified could be used as potential 'markers' of biological aging and in the future could be possible targets for anti-aging therapies. ... the study looked at 172 twins aged 32 to 80 from the TwinsUK cohort. The researchers looked for epigenetic changes in the twins' DNA, and performed epigenome-wide association scans to analyze these changes in relation to chronological age. They identified 490 age related epigenetic changes. They also analysed DNA modifications in age related traits and found that epigenetic changes in four genes relate to cholesterol, lung function and maternal longevity. To try to identify when these epigenetic changes may be triggered, the researchers replicated the study in 44 younger twins, aged 22 to 61, and found that many of the 490 age related epigenetic changes were also present in this younger group. The researchers say these results suggest that while many age related epigenetic changes happen naturally with age throughout a person's life, a proportion of these changes may be initiated early in life."