Low levels of vitamin D in the population as a whole suggest that most people need to take a vitamin D supplement. This may be especially true for seniors, as the ability to synthesize vitamin D in the skin declines with age.
Anyone who knows me will attest that at any time during the day, you are most likely to find me picking tayberries, 'deadheading' peppermint, or succession-planting shallots. There is almost nothing, really, that I would rather do.
It does kids no favors, and sets them up for a potential lifetime of poor health and social embarrassment, to excuse them from family meals of real food. Everyone benefits from healthy eating, but it is particularly crucial at the beginning of life.