Not many places allow assisted suicide however, when they do, it's for 'special circumstances'. On the other hand, there have been reports of "healthy" individual's, euthanasia requests being granted. Albeit, that is thoroughly debatable as many still do not consider mental illnesses as a variable in defining if someone is or is not "healthy" - for some profound and ignorant reasoning.
Specifically, I am referring to Belgium. Similarly, other countries allow it, also i.e. Switzerland.