Lalafells reach their max height pretty fast. During the Starlight Celebration with Damielliot, one of the kids is a lalafell but has a character model indistinguishable from other ages. This could be a fact of convenience to make it so they don't have to model separate ~10 year olds, but it fits. Lalafell faces don't really age and so the only way they tend to make themselves look more mature is with facial hair. (ex. Papashan, Lolorito)