Q. How old do you think Jesus’ disciples were?
I would direct you to the discussion in this post, which notes that movies tend to portray the disciples as middle-aged or older, certainly older than the 30-year-old Jesus, but which then argues (convincingly, I feel) that the disciples were mostly younger than Jesus, in their 20s or even teens. My thanks to Rick Thiessen of Allen Creek Community Church for such an excellent treatment of the subject.
Author: Christopher R Smith
The Rev. Dr. Christopher R. Smith is an an ordained minister, a writer, and a biblical scholar. He was active in parish and student ministry for twenty-five years. He was a consulting editor to the International Bible Society (now Biblica) for The Books of the Bible, an edition of the New International Version (NIV) that presents the biblical books according to their natural literary outlines, without chapters and verses. His Understanding the Books of the Bible study guide series is keyed to this format. He was also a consultant to Tyndale House for the Immerse Bible, an edition of the New Living Translation (NLT) that similarly presents the Scriptures in their natural literary forms, without chapters and verses or section headings.
He has a B.A. from Harvard in English and American Literature and Language, a Master of Arts in Theological Studies from Gordon-Conwell, and a Ph.D. in the History of Christian Life and Thought, with a minor concentration in Bible, from Boston College, in the joint program with Andover Newton Theological School.
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Good Question 
That was a fascinating essay. I guess I have been greatly influenced by the movie portrayals of the disciples. But considering them in their teens and early 20’s sheds a whole different perspective on them.