I suppose to a lower degree lots of shows focused around kids sort of do that. Malcolm in the Middle, Wonder Years for example focuses on kids being kids early on but towards the end they start focusing more on teenager stuff. "Stranger Things" also but I think in that case, the teens were suppose to e still younger than they looked in the final couple of seasons.
I guess so, but I feel like Harry Potter as a saga spans a much wider range as it was always going to be the focus. Meanwhile those shows just kind of went on did their thing.
Oh, and I can find a few more examples: Chrissy Seaver and Leonardo DiCaprio on Growing Pains.

