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Algebra Difficulty 2.0 Junior Find the answer Canada

Seven children, each with the same birthday, were born in seven consecutive years. The sum of the ages of the youngest three children is 42. What is the sum of the ages of the oldest three?

(A) $51$ (B) $54$ (C) $57$ (D) $60$ (E) $63$

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.