You have spent your life putting your children first. The idea of ever being a "burden" to them is out of the question.
The reality is, at some point in your life, you will probably need some kind of help. And even if you don't, no one lives forever. As parents, you expect to pass before your children. Do you have a will? Do your children know what your desires are for your assets once you're gone? Do they know what kind of end-of-life ideas you have? Do you?
To get an idea of the kinds of things you might want to begin addressing, here's an article you might find of interest: 8 Things You Must Discuss.
If you need help finding a professional for guidance, feel free to contact Light of Gray.