I think exact (though maybe incorrect, lol!) ages are given today and certainly all my later certs have exact ages. Not sure if this change was uniform or gradually became the custom and can't see anything about it in the Wiki or on Genuki or on the Certificate Tutorials site.
According to UK Marriage Certificates
"For current marriages, The Marriage Act 1949 which on January 1st, 2001 was amended, informs the current procedure require for marriages to be completed."
I have one from 1872 which says "full age"... but one from 1846 which gives the exact ages! I think it just depended on how much the vicar/whoever else was filling in the certificate cared about attention to detail.
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