英语翻译at 12岁 he got a serious illness which后面添什么

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At the age of twelve,he got ill which seriously ruined his health.
======以下答案可供参考======
供参考答案1:
At the age of 12, he had a serious ill/disease, which badly ruined his health .
后面添加的是： badly ruined his health.
供参考答案2:
He got a serious disease that ruined his health at the age of 12.
供参考答案3:
在12岁时,他的了一场病严重损害了他健康的疾病 (英语翻译)要用ruin
at the age of 12，he fell ill，which ruined his health badly.
供参考答案4:
His heath was ruined by a disease he suffered when he was 12.
或A disease ruined him( his health) at the age of 12.
供参考答案5:
A severe disease ruined his physical wellness badly when his was 12.