特に外国人の場合、見た目だけで年齢を見分けるのは難しいって英語でなんて言うの？
「年齢を見分ける」とは日本語でよく言いますが、英語で的確な言葉がわからずtellを使って作文してみました。
It's difficult to tell real someone's age just by looking, especially in case of other country's people.
よろしくお願い申し上げます。
回答
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It's hard to guess someone's age just by looking at them, especially foreigners.
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It's hard to tell someone's age just by their appearance, especially foreigners.
①It's hard to guess someone's age just by looking at them, especially foreigners.
→見ることだけで年齢を見分けるのが難しい、特に外国人の場合。
②It's hard to tell someone's age just by their appearance, especially foreigners.
→見た目だけで年齢を見分けるのが難しい、特に外国人の場合。
アメリカ合衆国 
