old - типичные ошибки в английском со словом old
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Не правильно ❌ Правильно ✅ Пояснение
1. He fell in love with a young girl of nineteen years old.

2. Rollo Martins is a fifty years-old writer.

1. He fell In love with a young girl of nineteen.

2. Rollo Martins Is a fifty-year-old writer.

1. a child of five'. 'a man of sixty' WITHOUT years old Compare: 'The girl was nineteen years old. •

2. Note two hyphens, NOT one. Nouns of measurement ('week' , 'gram', 'year', etc.) are always singular when used in compound adjectives: 'a ten-second silence', 'a six-minute wait' , 'a five-mile race'.