The setting is set to Forever but I cannot see my older texts.
Moreover, I cannot access the Messages icon/app unless I open the Phone app, select Contacts and the info (i in a circle) button, and then select Messages from the ribbon at the top of the contact. Then I Cancel out and I can see all my Messages, or at least all mt recent messages. When I search for the Messages app, nothing shows. It's not hidden in a folder or anything.
What's worse, even though I back up my entire phone, my messages apparently don't backup because that's a separate setting.
The only reason I have an iPhone is to receive group texts from my family and friends bc of Apple's cultish proprietary messaging. Ridiculous.