The only thing I can find on the age is "younger than 500 years":

> the average DNA fragment size for Ata is ∼300 bp which, based on a DNA-decay model (Allentoft et al. 2012), is consistent with a sample younger than 500 yr.

https://genome.cshlp.org/content/early/2018/03/21/gr.223693....

Carbon-dating and other forensic methods should be able to nail that down much more precisely. If nothing else, at some point, national DNA databases will pinpoint the fetus's relatives.

That contradicts this article.

Not necessarily, on age at least. The article just states:

> After death, DNA disintegrates into fragments, which become smaller over the centuries. Ata’s DNA fragments are still large, another clue that she’s less than 500 years old.