My theology has changed a lot since my early boyhood and manhood. In fact, I'd say that everyone's theology changes as they obtain new experiences, fellowship with other Christians, and study the word.
Example: If someone were to get saved at a Billy Graham crusade, it's highly likely that this person would not have a clue about the doctrine of the holy trinity, the diety of Christ, or other central doctrines of the Christian faith. Essentially, what they have done is embraced the most important doctrine - justification by faith - and understood that they have been adopted into God's kingdom and are no longer bound for hell. This, of course, is justifcation. Sanctification is the ongoing work in which God, through the Holy Spirit, molds us into the image of Christ.
It's obvious to me that sanctification includes a fine-tuning of doctrine. So yes, I think that our personal theology does change.
Just don't compromise the essentials.