I'd say they look as good today as they did new. Which is a lot more to be said then for most cars.
(Hondas for some reason seems to always have very modern looking headlights)
Whenever someone complains about the headlights I just think of the 911 GT1 street car and ignore them.
The lights are not idea but I don't really care for the front end of either the 991 or 981, the 981 has too square of headlights and the 991s Classic round lights are a bit out of place among modern cars.
(Random aside, what would a 986 slant nose look like?)