One of the things they can do with the help of an attorney, is to draft documents that determine in advance how mentally incapacity would be defined for them. That way if they start having problems, they will have documents in place to let someone else take over.
This can be better than relying on an elderly person, who is starting to see some signs of mental impairment, to recognize the problems and let someone else take over before a bad actor comes along and commits elder financial abuse.
Working with an attorney beforehand lets you also do several other things, such as creating trusts, advanced medical directives and powers of attorney.
