A Christmas tradition can last much longer than one stage of childhood if the roles change as the kids grow.
Let younger kids do the obvious fun parts
Young children usually love pouring, sprinkling, decorating, searching, and listening to the story.
Give older kids authority
Tweens and teens may enjoy choosing the theme, taking photos, managing the playlist, helping younger siblings, or keeping a surprise secret.
Keep the core ritual familiar
With The Tomte Cake, the story, baking, decorating, and finding Tomte can stay recognizable while each child's job evolves from year to year.
Avoid forcing equal enthusiasm
Not every child will love every part at every age. A durable tradition leaves room for different levels of participation.