Since we are talking about celebrants who are "not getting any younger," they may already have special dietary needs and may ask that the cake and food served at their party be compliant with their dietary requirements. Depending on their specific ailments or health conditions, their cakes may need to be gluten-free, sugar-free, nut-free, dairy-free, or egg-free. As such, it is important to ask your chosen baker whether they can accommodate your request for such a cake. Most big cake makers have already come up with their own recipes for healthier cakes.