It could be both.
"Coming of Age" describes how a young person puts aside childish wants and needs and accepts adult responsibilities and priorities.
"Redemption" can happen at any age, and describes someone who has done bad things, recognizes that they are bad, and wants to make amends and become good (for some values of "bad" and "good").
I should point out that if your story is about a man, not a boy, you're going to have some trouble with the coming of age part, but beyond that, sure, you're fine. A story about a juvenile delinquent putting his bad past behind him to become a productive and contributing adult would totally work.