As the parents of 19 children, Jim Bob and Michelle Duggar are well-versed in the various stages of childhood and adolescence. Today, Jackson Duggar, No. 15 in the Duggar lineup, is officially a teenager! If you go back and watch the Duggars introduce themselves in their first reality TV special, 14 Children and Pregnant Again, you'll notice that Jackson wasn't even born yet.
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Photos courtesy duggarfamily.com, TLC, dillardfamily.com