I remember my father telling me that every issue in his Christian life needed to be revisited when he was in his fifties and taken to a deeper level. I concur.
Theological issues that I resolved as a younger believer, I have had to wrestle with in more thorough ways. Personal issues that I overcame as a younger Christian, I have had to re-overcome. Spiritual disciplines that I locked in as a younger disciple, I have had to revisit and relearn.
My conclusions: We are always growing -- theologically, personally, spiritually. And our God is able to meet our needs at every decade of our lives. And the result is a deeper transformation.