I sent an important text message from my phone to my wife's phone in February of 2014. that particular text has sentimental value and I was just trying to retrieve it so I can screen cap it
I'm just touching my wife's last text message and then scrolling back through messages until the end last year in May. if I could just scroll back to February my other messages would appear
Oh, seems maybe you have a message limit set that when newer ones come in after that limit they erase the oldest one. You might try an SMS Backup app of the same name in the app store for Android to back those up to your phone, email, and cloud so they can be archived and restored.