The image appears to show the best age for women to marry to be early to late twenties and both article and image say late marriages are more likely to end in divorce.

So I think the general point of the comment you are replying to stands and is supported by the article.

Unfortunately those studies seem to be being misrepresented in much of the press which seems to want to accentuate the wait-a-little but are rather more quiet on the but-not-too-long message, presumably for reasons of being more appealing to the demographics they are "summarising" for.

I.E. marriages among people who choose to marry at those ages may well last the best. Does that mean they someone who would have married earlier or later should change their behaviour if they want a long marriage? Or is it some other quality of couples who do already make that choice that precipitates the outcome?