《史记·八书·封禅书》
这时他隐瞒了自己的年龄和经历，经常自称是七十岁年纪，能驱使鬼物，长生不老。
匿其年及其生长，常自谓七十，能使物，卻老。
At this time, he concealed his age and experience, often claiming to be seventy years old, able to drive ghosts and live forever.
<s>[INST] Kindly elucidate the central themes in this passage in English: 匿其年及其生长，常自谓七十，能使物，卻老。 [/INST] At this time, he concealed his age and experience, often claiming to be seventy years old, able to drive ghosts and live forever.</s>
Kindly elucidate the central themes in this passage in English: 匿其年及其生长，常自谓七十，能使物，卻老。
user
At this time, he concealed his age and experience, often claiming to be seventy years old, able to drive ghosts and live forever.
assistant