Android: Maximum cage age

<give us some feedback!>
Can I save my cage age forever? Maybe 30 days is not enough when I didn’t connect to the Internet. I don’t want to miss the feeds if I didn’t read it.

app version: 11.0.1
android version: 9 (R93-14092.57.0 release-keys)
device: Google Google Pixelbook (eve)
sqlite version: 3.22.0
username: aiweikai
server: default
speed: 0 feeds in conn:0 read:0 parse:0 store:0
pending actions: pre:0 post:0
premium: unknown
prefetch: yes
notifications: no
keepread: no
thumbs: yes

30 days is for unreads, but stories can stick around forever, up until the limit for feeds which is between a hundred and 500 stories, depending on popularity and publish interval.