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There are places where it is impossible to get the recommended amount of sun exposure, even if you were to spend most of your day outside.

There's an app called Dminder that notifies you when the sun is in the optimal position (highest point in the sky) to generate Vitamin D based on your location.

Where I live, there is no optimal position for 8 months of the year.

Where I live, it is impossible to get strong enough sunlight for 8 months of the year. Everyone here is deficient without supplementation.

Older folks most at risk can't make it naturally. D3 is the best bet and complete.

If you consider yourself too old for getting outside than you are having too bad quality of live to have a reason to keep care on your health.

Nope, older folks can’t make it—period. Not even sitting in a bikini at noon at the equator. We lose the ability as we age.