he has been joining the army since he was 19这个句子有误吗

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• he has been in the army since he was sixteen.这个句子是正确的吗?不是连续动词加一段时间吗?
• he has been joining the army since he was 19这个句子有误吗
• he has been joining the army since he was 19这个句子有误吗
• he has been in the army since he was sixteen.这个句子是正确的吗?不是连续动词加一段时间吗?since he was sixteen 是一段时间吗？连续动词候只能加一段时间吗？
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