My son is 2 yrs old. I breast fed for the first 3 months of infancy. But I still get very minimal milky discharge. No pain, foul smell, or discoloration?

Breast. It could be a normal variant. However, see doctor. Need to chech for blood , prolactin, do exam. Bilateral non-bloody. Non-spontaneous (only comes when you squeeze nipple) and normal prolactin usually are marker of benign normal nipple discharge.
Normal. This is normal. In fact, some women get the let down reflex hearing any baby cry.