Termite issues are quite common in older houses

Termites are frequently thought of as a problem for older homes, but I have also observed active termites in the wall framing of more recent homes and renovations—some of those under 15 years old.
Termite activity can sometimes be found under the house slab of newer houses, where the soil is more temperature and moisture controlled. The termites gain entry into the house from around the plumbing pipes or due to holes in the slab from concrete formwork pins that are removed when finishing off the slab surface.
This is an excellent reason to always have a pest report included with your house inspection.