One important detail in the article, but not the headline, is:

In short, these age patterns might be signs of secularization... However, it’s also possible that some of the age differences in religious affiliation revealed in a single survey could result from people becoming more religious as they grow older.

Here's an article from the same research firm last month that examines a different measurement: https://www.pewresearch.org/religion/2025/02/26/decline-of-c...