There is some misinformation on this thread. Not surprising really - few people understand how predictive text really works and many assume that all predictive text keyboards work the same way. They don't.
Some predictive text keyboards keep a different dictionary of commonly used words for each app, others use a system-wide dictionary. If the keyboard uses a system-wide dictionary it may offer words for text messages that have never been used in texts but have been used in other apps.
The fact that a word is being offered by predictive text does not mean it has been used recently. It means it has been used regularly at some point. Most predictive keyboards will stop offering a word eventually if you ignore it often enough, particularly if there is another word you use regularly instead of this word, but, depending on which keyboard is being used and how you use it, it can continue to be offered months, even years, after it was last used.
Some predictive keyboards offer words that you may never have used on your phone at all, let alone in text messages. Google's keyboard, for example, uses anything you've typed in to your Google account regardless of which device you were using at the time, so words you have used on your PC in GMail, Google+, YouTube and web searches may pop up on your phone. And some keyboards offer you words that are trending in social media even if you have never used those words at all.
So it is possible that the words you see when starting a text message may not have been used recently in texts and may never have been used in texts at all. There is a good chance that the words offered were used regularly in text messages at some point but even that is not certain. It all depends which predictive text keyboard is being used.