As soon as possible. There’s no such thing as ‘too early’, especially if you’re wondering when to get power of attorney for elderly parents.
You can only give someone power of attorney if you have the mental capacity to make that decision at that moment. If you wait, and something happens — an accident, or a condition like dementia becomes more serious — then it will be too late.
For this reason, the best time to get a power of attorney set up is as soon as you think of it.
Like a power of attorney, it’s best to make your will long before it is needed. After all: when it comes to protecting your family, there’s no time like the present.