They certainly seem to last a pretty long time. The
Goodyera will spread a lot as it gets older, individual rosettes only last a few years but they can grow into massive colonies (I will try to get a picture of one soon). The
Corallorhiza species are much the same, they can live for a very long time (some species can go dormant underground for nearly 10 years at a time).
Platanthera unalascensis Calypso bulbosa and
Dactylorhiza virides are pretty slow growing, and usually only have one growth at a time, but they will spread eventually, usually by putting off an extra shoot during the growing season which eventually becomes a separate plant as the old growth dies off. As far as
Calypso bulbosa only living a few years, I suspect that is a myth, I have encountered several large specimens that would have to be pretty old. One striking example of this is this
Calypso bulbosa nothovar. kostiukiae (the natural hybrid between the eastern and western varieties). I am fairly certain it is one large colony that spread vegetatively from one plant, as it would be highly unusual for so many plants of a natural hybrid to all grow in one place, especially with so little variation between flowers. I expect it would take at least 15-20 years to grow to this size.
Yard Orchids 2020
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