我知道学习一门外语是很困难的，尤其是当你年纪变大而没有精力学习新的东西。
I know it is hard to learn a foreign language especially after you become older and loose your energy to learn something new.
研究者说这个发现建议当人们年纪变大的时候服用足够的营养素能帮助改善思考和记忆技能。
The researchers say the findings suggest that getting enough nutrients could aid thinking and memory skills as people get older.
随着他年纪变大，粉丝们只能隔几年才看到他的电影，因为他的身体不再是强大到足以做大幅度和危险的动作。
As he gets older, the fans only see his movie every few years, for his body is no longer strong enough to do the big and dangerous action.
然而，值得重申的是：尽管激素水平会导致肌肉发生变化，但是年纪变大并不是引起肌肉减少和肌力退化的惟一原因。
However, it's worth repeating: Although hormonal processes cause some muscle changes over the course of your life, shrinking muscle mass and decreasing strength aren't caused by age alone.
然而，值得重申的是：尽管激素水平会导致肌肉发生变化，但是年纪变大并不是引起肌肉减少和肌力退化的惟一原因。
However, it's worth repeating: Although hormonal processes cause some muscle changes over the course of your life, shrinking muscle mass and decreasing strength aren't caused by age alone.
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