So my school loans were reporting all 17 of them. This gave me a great aaoa of around 19 years. Credit Karma and Credit Sesame show account aaoa for free. I do t worry to much about the scores as I have many other ways to check. My Experian app shows the same drop.
I added a new 3% card as my daily driver within the last month and a new car in November. It's just bad timing as I thought my 19 years of loans would still show. They do not and there is a new 28k school loan tradeline on my credit. I've grown my credit from 500s (started with a cap1 secure card) to 800s since 2015. It's a great feeling to hit 800. The 40+ point loss was a reminder not to apply for credit/car loans in a short amount of time. I owe the school loans and they will get paid. My loans were around 76k - 20 years ago. Now I owe a bit over 28k.
With the comment, they can add your loans back to your credit anytime they want 7 years is not always so.
Just as they can add them, they can also remove them as that just happened to me.
250k+ CL and climbing.