I genuinely can't imagine a child aged 5 latched onto a breast and feeding.
It feels wrong and is really for the mother's benefit.
Once a child is weaned, they don't need milk at all. There are many cultures where they don't drink any milk or BF beyond weaning.
Hard as I try to, OP, I cannot see why you do this.
I don't think, even after almost 1K posts, you've been clear or honest about your own mindset.
I can only assume it's a bedtime ritual like reading a story and settling them down, but the pleasure is all yours as it makes you needed, in some way.
In western society, seeing a child aged 5, in school uniform, (or in their PJs) suckling at the breast is not the norm.