It is possible to register substantial time in the Christian life and it does not mean a thing except that person is getting old. Many people offend easily. They wear their feelings on their sleeves. This person is obviously still a baby. They do not understand the principles of God's Word nor how to apply them.
Maturity is maximum application of truth to experience.
If we apply God's truth regularly to our sin and failure, we will grow. If Christ becomes the center of our choices for living, we mature. Application of truth. The application of what you know about God makes the difference. Two people can know the same amount of the Word.