My boobies just randomly started leaking?

Hey girls.

I am a mother of two, my youngest is almost 5 years old. I breast fed my youngest for two years and dried up about three years ago. I have always been able to squeeze out the random drop of clear fluid here and there, but never more than a pin-head sized drop and never one after another. My boobies are so sore and I'm consistently able to get out a pretty big drop of what i can only describe as colostrum, even one after another. This has never happened. What do y'all think it is?