I used to work in social services with the elderly. One of the saddest things was to watch the anger of adult children that have to purge their deceased parents "stuff". How so much just went into dumpsters. Some having to take off work, fly to different states in order to accomplish this. If you want the last memories of you to be angry ones, just say "I'll let the kids decide what they want when I die - they can do what they want with my things. Do you think they really are going to go through your 200 book collection one by one?
If you do move "to be near the kids", just remember they may move away...due to jobs, etc. Are you going to follow them around?
Yes, Doc-, I agree - plan ahead. Lots of ways to do that without compromising a lifestyle too much or being dependent on others. To me, that's part of being responsible for yourself.