заживать чужой век 🎓²

https://idioms_ru_en.enacademic.com/3118/%D0%B7%D0%B0%D0%B6%D0%B8%D0%B2%D0%B0%D1%82%D1%8C_%D1%87%D1%83%D0%B6%D0%BE%D0%B9_%D0%B2%D0%B5%D0%BA

заживать чужой век

прост. live to a ripe old age; reach a great age...

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https://idioms_ru_en.enacademic.com/3118/%D0%B7%D0%B0%D0%B6%D0%B8%D0%B2%D0%B0%D1%82%D1%8C_%D1%87%D1%83%D0%B6%D0%BE%D0%B9_%D0%B2%D0%B5%D0%BA