While there are different causes of dwarfism, the wikipedia article on dwarfism states that in general they don’t have shorter lifespans.
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Hypotonia, or low muscle tone, is common in dwarfs, but intelligence and lifespan are usually normal
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It’s not just conditions like Acromegaly that cause a shorter lifespan. Just being tall is apparently enough to shorten your lifespan.
In general, being tall is associated with being more healthy. I found several NIH articles that contradicted this (except of course when malnutrition causes a short height), and all of them expressed concern that our attempts to raise taller children, thinking that they are healthier, will actually have the opposite effect.
Thanks. Now I’ve got that song stuck in my head.