Leach's Storm-Petrel lives a long time and produces only a single chick a year. Adults journey for days to get food for young. Wing feathers of parents were experimentally shortened increasing the amount of work they had to do to fly. When parents were handicapped this way, they passed the increased reproductive costs to offspring and maintained their own nutritional condition. Better to give up on it and do what is necessary to live to reproduce another day.
Starlings produce several young in a brood and only a few broods.
Older females should be less likely to have additional offspring, so they should not hold back resources or care. Clutton-Brock has good data on this in Red Deer. Of course there are other factors here as well. Experience, size, etc. In sexually reproducing species, parent and offspring are not identically related.