There are many types of formation, and we should be seeking and getting all types until our last day.

Spiritual formation:  practices in prayer, examination, making resolutions, learning how to seek and receive spiritual direction, getting the most out of Confession, maintaining a presence of God during the ordinary day, types of prayer, dealing with the "Cross" of ordinary living.

Doctrinal formation:  teaching on Scripture, formal Church teaching, learning "sound criteria" for moral decisions, learning about the Sacraments, grace, moral law, bioethics, metaphysics, Encyclicals, CCC, etc.

Human formation: learning about the human virtues, how to improve in these many virtues, receiving and giving correction, reconciling the intellect, the will, and the passions.

Apostolic formation:  being a better friend, how to talk about supernatural matters, bringing others closer to Christ and His Church.

Cultural formation:  history, arts, etc, helping us to be better conversationalists.