Heroic Childhood to Adulthood

Many fictional heroes used to be little kids, but now are full-grown adults.

Examples

 * Zootopia opens with Judy Hopps as a child before fast-forwarding to a few years later, where Judy is an adult.
 * The original roster of Team Prime (Bumblebee, Optimus Prime, Ratchet, and Bulkhead) gained updated bodies by the events of Transformers: Robots in Disguise, which is set three years after the end of the Transformers: Prime finale "Predacons Rising".
 * Likewise, Blurr is shown sporting a new body with an updated color scheme, implying that his guest appearances in Robots in Disguise take place long after the end of Rescue Bots.
 * The original Ben 10 series depicts Ben and Gwen Tennyson as each being 10 years old. In the sequels, they are 11 in the primary flashbacks of Ben 10: Omniverse, 15 in Ben 10: Alien Force, and 16 in Ben 10: Ultimate Alien and the present day timeframe of Omniverse.
 * Similarly, Kevin Levin is 11 in the original series, 12 in Omniverse flashbacks, 16 in Alien force, and 17 in both Ultimate Alien and Omniverse.
 * The climax of the song "Hakuna Matata" features Simba growing up from lion cub to adult; The Lion King 1/2 features some scenes set in between the time skips.
 * The 1964 Addams Family television series depicts Pugsley and Wednesday as elementary school-age children. Subsequent media portrays them as preteens in the 1990s live-action film series and teenagers in the 1977 film Halloween with the New Addams Family.
 * The original Dragon Ball anime features Goku as a child. Subsequent installments of the franchise shows him growing up into an adult.
 * While the 1990 adaptation of Stephen King's It portrays Bill Denbrough and the Losers as children during the first half, the second half fast-forwards to when they are adult 30 years later. This time skip is echoed in the 2017 film and its sequel It: Chapter Two.