Ageing is the word that describes all that change as the organism evolve and it also includes growth !
The answer is young child.
Nasal regurgitation it's when the food regurgitates out of the nose.
This is more likely to occur in babies/ young children with some birth defects in the soft palate, or if they have a cleft lip. Those birth defects, usually, get fixed with surgery when they are still children, that's why is less frequent after that age.
Digestion, medulla, heart, and involuntary muscles
