I see some who are walking with a cane, or using a walker, and sadly some are in assisted living centers. NO WAY would I want to end up like that!
You're making unwarranted assumptions here. Bodies fail. Minds fail. Not always in sync. Consider that these old folks you see walking with canes and walkers are actually out in the world, despite the pain (or whatever else) drove them to adopt they assistance they use.
And they're not at the end yet. We tend not to see that part of other peoples' lives.