[1] It is the band's first studio album to feature guitarist Mike Dimkich and drummer Jamie Miller, replacing Greg Hetson and Brooks Wackerman respectively, and the first one to be produced by Carlos de la Garza, thus ending their collaboration with Joe Barresi, who had produced, mixed or engineered every Bad Religion album since 2004's The Empire Strikes First; Barresi did, however, mix "The Kids Are Alt-Right", which had already been released as a one-off single in 2018.

Bad Religion's intention for their seventeenth studio album was revealed by guitarist Brett Gurewitz about ten months after the release of True North, who said, "We'll play some shows next year, not heavily.

"[3] By early 2015, Gurewitz and vocalist Greg Graffin had begun writing songs for the album, and plans were made to enter the studio that fall.

[8][non-primary source needed] Speculation resurfaced in April of that year when Gurewitz and Baker posted pictures from the studio on their respective Instagram accounts.

[11] Despite earlier reports that Bad Religion had been in the studio by mid-2018, and the fact that they had released one new song, Gurewitz told Los Angeles Times in July 2018 that, "We're writing for a new album, recording this fall or late summer.

"[12] On February 26, 2019, Bad Religion announced Age of Unreason as the title of the new album, its release date, and premiered the lead single "Chaos from Within".

Wall of Sound gave the album a 9/10 stating: "Since their formation in 1980 the band have been challenging their listeners with music that appeal to their fans humanity, reason and conscience.