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« on: Saturday 14 November 20 23:45 GMT (UK) »
I have Jones in Wales as well, so you have my sympathies.
Ages should occasionally be taken with a pinch of salt. Some of my lines are very consistent, others not so much. My Welsh lines are not so much. One of mine, Walter Jones, varies his age on census so much that his date of birth was anything between 1805 and 1821- tailored somewhat to each of his two wives (the first being significantly older, the second being significantly younger). He was actually born, or at least christened, in 1808, which matches his eventual death. A difference of two years isn't much sometimes, especially when ages can vary a year depending on whether or not someone has had their birthday at the time. I think at 19 she'd still have needed parental permission to marry (?) so fibbing about that seems odd.
And yes, certificates obtained from the GRO can contain errors because they are copies of the originals. I have a few that have mistakes, such as one that has a marriage date of 1888 when the original image and index are 1887 and another where the middle name was written as Henderson when she was Harrison. If the original wasn't clear it's possible the copy was miswritten, or just a mistake happened. There are a lot of times that the original has errors though, intentionally or otherwise.