If you actually had a right to an accounting through those years, then I'd say you would have the right to a full accounting. (Which is a technical term.)
If you did not have the right to an accounting at an earlier time, but now have the right, I don't think you have the right to an accounting for that earlier time. We have a beneficiary in a trust we are trustee of who disagrees and we are in litigation right now regarding the question. If this is the situation you are in let me know and I'll let you know what at least one probate court in CA decides when they decide.
When you are a Bear of Very Little Brain, and you Think of Things, you find sometimes that a Thing which seemed very Thingish inside you is quite different when it gets out into the open and has other people looking at it.
--W. T. Pooh (aka A. A. Milne)