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Nope, it is not calculated into scores. You did good by keeping up with your payments and now you still have a 5-year-old good account on your reports.
I agree, this is helping, not hurting you. Just let it sit there and add to AAoA as long as it wants to stay.
Like others said, you are fine.
1 account closed by credit grantor really does zero harm. Many accounts closed by credit grantors on the other hand, will look very suspicious during a manual review (i.e. mortage app). Then again, it's still not the end of the world. You just have to come up with a convincing story.