So it does depend on the individual and their specific circumstances.
We're taught that death is the worst thing that can happen to you, that when you die you might go to a place full of fire and burning and torture forever, that trying to extend your life (exercise, nutrition, psychology, cosmetics, etc) is the ultimate goal. We are not taught to get the most out of life when we're young, we're not taught the practical skills that would give us more contentment through life, and we're not taught that death is a natural and normal part of life.
We need a class in school called "don't fear, just plan: organize your way to a happy life and be fine with dying sooner." Teach people how to stop sitting around wondering how to be happy, and just give simple practical skills and workbooks. Things like "how to pick your career", "how to choose where to live", "how to actually manage your finances", "how to make friends", "how to get a significant other", "how to manage your emotions", "how to deal with conflict", "how to deal with a life change", "how to enjoy life for free", "how to balance work and life", etc. There are answers to all these things, but they aren't taught in school; we're just expected to bump into them somewhere in life, after decades of grasping around pretending like we know what we're doing. We waste so much of life because nobody has taught us what to do.
By the time you're 60, you should have already had a vivid, exciting life full of friends and opportunities and special moments. But many of us haven't! I put it down to simply not learning how. If we expect every kid to learn completely useless shit like Calculus, we should definitely teach them the more important life skills sooner.
Terry Pratchett, after being diagnosed with early-onset Alzheimer's, made a documentary called Choosing To Die, which you might be interested in. He had stated that he wished to die by assisted suicide, but ultimately Terry died at home from Alzheimer's.
That being said I think assisted suicide should be an option and everyone should have this option.