On Youth and Old Age, On Life and...

论青年和老年，论生与死，论呼吸。

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To base on the age of consumer, sporting goods can be divided into the following categories:children's sporting goods market, youth sports market and the old sporting goods market.

以体育用品消费者的年龄为依据，可以将体育用品分为以下几类，儿童体育用品市场、青少年体育用品市场和中老年人体育用品市场。

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For example, the Old Man and the Sea is a meditation upon youth and age, even though the protagonist spends little or no time thinking on those terms.

比如，《老人与海》是是关于对年龄的思考，但作品中的主要人物并没有在这个问题上花费什么时间。

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