I understand you saying that the renderings are different, but are you also saying that the true AAoAs are different in all four cases? For example, 1.33 years and 1 year 4 months are different renderings but they are really just two different ways of saying the same thing.
On the other hand, 1.33 years and 1 year 6 months are clearly not saying the same thing.
Here are some possible explanations:
(1) The different AAoA calculations were not all done on the same day and the same hour. If as little as a few hours of time elapsed then something could have changed on the report that changed the AAoA. Certainly if one pull was done in late Jan and the other in early Feb (for example) you'd expect there to be a difference.
(2) Different AAoA calculations might be based on different bureau data. You should expect that your TU AAoA might well be different from your EQ AAoA, unless you have pored over the two reports and confirmed that they have exactly the same accounts with the same dates opened.
(3) Some AAoA calculations might include AU accounts and others might exclude them. I am pretty sure that the EX CW credit monitoring tool you mention includes or excludes AU accounts depending on whether it is the app or certain places on the desktop tool. Some of the people here can tell you which does what.
BTW, if your chief interest is in finding out whether the back end FICO 8 algorithm is counting your AU account, these front-end summary pages won't give you a way of knowing that.
Happily there is a test you can implement that will answer that for sure. Let us know if you'd like to know what that test is.
Just an FYI (if I understand your post) - I have EX credit works premium subscription and all of my age factors match the different tabs and match MyFico.
Also, how accurate is the simulation software for Experian credit works and MyFICO? I’m really trying to figure out my FICO average age so I can predict the breakpoints.
Not at all accurate and should never be relied upon. This goes for all simulation software, not just EX or MF products. They are all very unreliable. Predicting the thresholds is a much taller order to be honest, as there aren't many that are concrete when it comes to AAoA and/or AoOA. You can search through threads and find people that "think" they've found one, but their data usually comes with other variables, dramatically lowering the accuracy of it. The only two that I have found on my profile that I'd consider to be "clean" data points where at AAoA of 78 months and 90 months, where I saw slight ~4 point increases at both points.
Thanks for the kind word, Birdman.
BBS is right. Trying to infer whether an AU is being counted by FICO 8 based on simulation predictions is very dicey. The All Zero test you are familiar with is easy and will incontrovertibly answer your question.
Age of accounts factors increase on the 1st of the month, yes. So, if you pull your scores on the 1st and nothing else changes on your CR, you can isolate an increase potentially to an age of accounts factor. If your inquiries become unscoreable later that month, say the 12th, you could pull your scores at that point and see the impact of the inquiries no longer hurting your score.