Don’t set expectations. As a wise person once observed to me, “It’s amazing what you can accomplish when you don’t have expectations.” Goals set too early in an endeavor can be worse than useless. They may lead to disappointment if timelines aren’t met, to imagined competition with others, and to frustration with progress perceived to be too slow. None of this is helpful. Even if you meet some arbitrary goal, so what? You would have gotten there just the same simply by putting in practice time.
As an older learner taking up the guitar, there’s simply no way to know what you’ll accomplish. So don’t worry about it. In fact, try not to even think about it. Enjoy the journey and what you discover about music, the guitar, and yourself.