这里的“生理年龄”是指epigenetic age，主要指DNA的甲基化程度，

它是受环境因素影响所致，其中至少一部分应该是可以逆转的。泛指就是注意饮食，锻炼，不要肥胖，减少化学物质的污染之类，饮食上具体咋做好像不大明白？

A person's epigenetic age is calculated based on an algorithm measuring 71 blood DNA methylation markers that could be modified by a person's environment, including environmental chemicals, obesity, exercise and diet. 

In DNA methylation, a cluster of molecules attaches to a gene and makes the gene more or less receptive to biochemical signals from the body. The gene itself—your DNA code—does not change.

http://medicalxpress.com/news/2016-02-biological-age-older-chronological-dying.html

前不久看到一个有关糖尿病人的研究，说他们的某些基因的甲基化与健康人有很明显的不同。