眼球晶状体的柔韧性随着年龄的增长而降低；因此普遍的情况是随着我们年纪变老，我们的视力就会变差。
The flexibility of the lens decreases with age; it is therefore common for our sight to worsen as we get older.
随着我们年龄的增长，眼睛的晶状体变厚，因此对光线的折射也会发生变化。
As we age, the lenses of the eyes thicken, and thus refract light differently.
通过对血液样本的分析，Samani教授和Spector教授发现，有些人具有与其年龄不相称的过短染色体端粒，而一种特定的基因序列在这些人中更常见。
From blood samples, Samani and Spector found a particular gene sequence was more common in people who had unusually short telomeres for their age.
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