Judging by his appearance, he is very old.

由他的外貌来看，他很老了。

youdao

Judging by his appearance, he must be over sixty.

从外貌上看他一定有六十多岁了。

youdao

He hadn't dared approach her house though, because, judging by her sister's reaction, he was sure her parents would not take kindly to his bedraggled appearance.

他不敢去她家，因为从她姐姐的反应看，她爸妈肯定也看不上他这副脏兮兮的样子。

youdao

But the stories of bin Laden's life-threatening kidney problems are false, judging by his appearance in videos that he released in 2004 and again in 2007, in which he showed no signs of illness.

CNN: Commentary: Where's Osama bin Laden?