Well, again I don’t know the codes in her area. But ten years is certainly old enough to qualify as historic in theory - the criteria for historic aren’t really primarily about the age of the structure, although age does contribute heavily.
For example, using the code where I live, a 20 year old tract home would be historic if all the other 200 identical tract homes surrounding it had been torn down, and the surviving home incorporated interesting features or represented a significant stage in the work of the architect or builder. An even better example is Delaware’s only Frank Lloyd Wright house - it was was historic the day it was completed in 1958.
