This is an interesting question. Many glaciers move at rates of more than several meters per year. This would imply that individual natural=crevasse elements in OSM are likely to become stale fairly quickly – if they’re not already out of place because of the age of the data used to map them.
However, crevasses do form in predictable locations on glaciers and many of these locations are determined by aspects of the terrain that do not change so quickly. E.g., along the margins of a glacier or where the glacial valley widens, bends, or changes slope. This would imply that an area where crevasses are likely may be more permanent than the individual crevasses themselves.
I’m not sure this is something that has been mapped so far, but perhaps it may be possible to use Key:hazard - OpenStreetMap Wiki for this situation.
Where did you get this data set? Is there some specific guidance on the use of the data?
