Hi, you'll find useful reading in the nutritional guidance issued by your home nation eg if in
England the eat better do better publication
The foods themselves won't alter so much for each age group rather the quantity or amounts given so that RDAs - recommended daily allowances are respected.
What you'll be looking for are foods that are appropriate and inappropriate eg. serving no meat/animal by products for lifestyle choices, danger of high sugar and salt and maybe avoiding honey for the under 1's due to possible health risks.
HTH best wishes