The 1917 Code of Canon Law required the candidate to have completed 24 years of age before ordination to the priesthood:
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Can 975. Subdeaconship is not to be given before the completed twenty-first year of age; deaconship not before the completed twenty-second; priesthood not before the completed twentyfourth year of age.
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So, yes there was a change in the age requirement from the 1917 code to the 1983 code.