Ideally, I say no. Suicide should be as free a choice as what you will choose to drink or eat in a day.
I like the idea of going to a center and paying to have everything prepared for you - a suicide capsule for example that can also act as your casket (Ala Sarco), funeral, grave plot, cremation, financial matters and will. All according to what a person wants, not what government, controlling family or a maniacal obsessive meddling control freak society wants.
The only rules being that you have to be considered an adult to make the decision (So in most countries that's 18 I believe), no illegal requests of course and that you and your family waive all rights to lawsuits against the company assisting you. If you are too young and suffering I think the parents with the child should be allowed to make the choice for assisted death and in the case a child is going to be born deformed or with terrible disabilities the parents should be allowed to terminate the pregnancy late term. A child should not have to be born into this world like that and suffer.It's sick, repulsive and unnecessary!