“SA and Africa look like they fit together” is a good example, because at first glance it looks just a dumb coincidence and not any kind of solid evidence. Indeed, it’s partly for that reason that the theory of continental drift was rejected for a long time; you needed a bunch of other lines of evidence to come together before continental drift really looked like a solid theory.
So using the continental drift argument requires you to not just demonstrate that the pieces fit, but include all of the other stuff that holds up the theory and then use that to argue for the age of the earth.
Unfortunately I don’t know of any other evidences for the age of the earth or universe that have shorter argument chains. It’s genuinely hard! (And partly for that reason I wouldn’t be too surprised if new evidence caused us to revise our estimates for the age of the universe by a factor of two in either direction.)
“SA and Africa look like they fit together” is a good example, because at first glance it looks just a dumb coincidence and not any kind of solid evidence. Indeed, it’s partly for that reason that the theory of continental drift was rejected for a long time; you needed a bunch of other lines of evidence to come together before continental drift really looked like a solid theory.
So using the continental drift argument requires you to not just demonstrate that the pieces fit, but include all of the other stuff that holds up the theory and then use that to argue for the age of the earth.
Unfortunately I don’t know of any other evidences for the age of the earth or universe that have shorter argument chains. It’s genuinely hard! (And partly for that reason I wouldn’t be too surprised if new evidence caused us to revise our estimates for the age of the universe by a factor of two in either direction.)