Alden most likely grew up in Carvahall. He was probably a butcher, like Sloan. When he was of suitable age, he married an unnamed woman and she gave birth to Sloan, and perhaps other children, though that is not known.
Alden is most likely dead, as Sloan has control over the butcher business, and Katrina has never mentioned her grandfather. He was not mentioned among the villagers that left for Surda or stayed in Carvahall.