Quick/easy way to calculate AAoA?

[Anonymous]

Is that rounding factor proven? I have an AAoA of 9 months. So it will have no score impact until at the earliest 12 months, and then make no difference until 24 months? Has anyone confirmed that with data?

I would have expected to see score impact on 6 month intervals, 6, 12, 18 etc.

[Anonymous]

BTW, an easy way to calculate it in excel is to put all the dates in, average the dates, then calculate the number of months since the "average date" you calculated. However. Whether that produces the same result as FICO, I don't know. It produces a result that is close, but if you wanted to know exactly how they round and exactly what day it increases.. Dunno.

[CH-7-Mission-Accomplished]

I've read of the whole number, rounded down, on this site and others.  Here is a quote and a link from a myFICO moderator with 32,000 posts:

"Round down as in round down to the next lowest whole number. FICO only cares about 12, 24, 36, 48, 60, etc...months. So eyeballing it, 43.66 months falls between 36 and 48. Since you haven't hit 48 months, the fallback is 36 months or 3 yrs. Once your avg. hits 48 months (inside of 5 months from now), then FICO will read your AAoA at 4 yrs for the next 12 months, then 5 and so on. FICO doesn't care how many months you are into your 3rd yr. Hope that makes sense."

http://208.74.204.68/t5/General-Credit-Topics/Average-age-of-account/td-p/423402

[masscredit]

I know it's not real but something interesting that I noticed on Credit Karma's site - We calculated your age of credit history by averaging the ages of your open credit accounts.

They don't do anything with closed accounts from the last 10 years. Just wanted to note this for the people that use their site and do a quick glance at the AAoA that they list.