They are also referred to as cummerfolds or laugh lines: the nasolabial folds. The prominent facial wrinkles run to the right and left of the nostrils and extend to the corners of the mouth. In some people they are particularly pronounced.
This has to do with facial expressions and age on the one hand, but also with personal predisposition. Similar to the frown line on the forehead, they quickly convey a tense and sometimes grumpy impression.