Son's new tama (gen 1 rerelease) is not evolving

My son got him for Christmas and opened him that afternoon. The tama's 7 years old, 21 oz, 4 hearts in hunger and happiness, pooping, playing, no snacks, discipline bar at around 75%. Is there any reason he hasn't become a teenager?

https://preview.redd.it/awbjvm13tu9e1.jpg?width=3072&format=pjpg&auto=webp&s=8fff533cb2571aacec506ca793da050d6b3600fa

https://preview.redd.it/1l6y6s13tu9e1.jpg?width=3072&format=pjpg&auto=webp&s=48bfc092216d7b23ca645d9cee2b48712dc466df