Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Incredibles Symbol Infant T-Shirt 12-18 Months
Product feature: 100% Cotton, ASIN: B00GOW2QJ6, Item model number: IN002IS, Date first listed on Amazon: July 6, 2016, Average Customer Review: 4.5 out of 5 stars 3 customer reviews
Product brand: Mad Engine
Target attributes: Age Group
Answer: attribute: age group
value: 18 months
source: product title