翻译：老年人有长处，但也有很大的弱点 —— 老年人容易固执，因此老年人也要有点自觉性。
Old people have strengths but also great weaknesses—they are easy to be stubborn, for example—and they should be aware of that.
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翻译：Itisnousetellinggrown-upchildrennottomakemistakes,bothbecausetheywillnotbelieveyou,andbecausemistakesareanessentialpartofeducation.