I'd say it's more that 'it's complicated and dependent on region'. After all, there is a specific claim there that in Grecoroman society the stereotype that girls got married the moment they started bleeding was true. And no doubt anthropologists could list societies fitting every marriage age bracket from before conception to 'never'. (But it does mean that we can't pride ourselves on how civilized we are compared to our barbaric ancestors as of, say, 5 centuries ago.)