One of the horrors of science is that sometimes you have to let go of things that are comfortable, familiar and seem right but are then found to be not the best fit for the evidence. I can't count the number of updated names of plants and animals that I've had to re-learn, but this one is a big one.
Sort of nutty, especially if fried. You might need to try more than one . . .
They have taste receptors a bit like us and like us, they get a lot of their taste sensation from what they can sniff. (Don't believe me? Blindfold a volunteer. Hold a freshly cut slice of apple under the nose. They'll happily munch a piece of raw potato thinking it to be apple)
Mostly they are looking for food, which is usually some sort of wood. Sometimes they've come to your house chasing water to drink and then look around for closer food.
Not all types of ground-nesting termites build mounds. The only termite mounds of note in North America are either fossils or models. But mounds are common in Africa, SE Asia and South America.
There's no simple answer to this one. It depends. Species, life-type, wear and tear, colony health--all these things affect the potential for a long life.