Read Hebrews 5
Focus on verse 12-13
Just because a person grows old – does not necessarily make him or her mature. This is not a physical condition. Physically we grow old whether we want to or not. Character wise however, is another matter. I have met som people who are old in years, but who still act like babies. They whine and cry when they are upset, the throw tantrums when they are angry, and essentially carry on like children on a playground despite the fact that they have adult bodies.
This maturity issue is also present in the spiritual realm. There are people who have been aware of God, and may have been attending a church for fifty or sixty years, but who remain spiritual infants in regard to their spiritual maturity level. They have never found a reason to grow up in the faith. The writer of Hebrews addresses exactly that issue in today’s reading.
For though by this time you ought to be teachers, you need someone to teach you again the basic principles of the oracles of God. You need milk, not solid food, for everyone who lives on milk is unskilled in the word of righteousness, since he is a child. (v. 12-13)
Apparently some of the people in these parts had been part of the church for quite some time, but had just never really developed any level of spiritual maturity despite the fact that they may have been part of a church for quite some time. Spiritual growth and maturity does not typically happen by default, it is brought about by deliberate steps of obedience and self control. Spiritual maturity is the result of intentionally making choices that cause us to grow up in our walk with Jesus.