I for one wouldn't mind seeing the gang as adults would be an intresting idea....but now I that I think back to the end of the original movie the idea of the gang grown up telling their children of their own adventrues actually makes a little bit of sense...as the narrorator put it
'Generation after generation, each passing on to the next the story of their ansestors journey to the valley long ago...' I would also assume that would include the original gangs adventrues as kids....