This paper examines the relationship of age factor to second language acquisition. Age as an affective factor brings about different performance stages in second as well as first language learning. Traditionally, research in Critical Period Hypothesis and other variables has derived two major aspects of language learning--the younger = the better and the older = the better. However, more recent research has begun to show that there is no linear pattern of learning among the same age group of learners, and they learn differently and individually depending on variables like learning opportunities, the motivation to learn, individual differences and learning styles in second language acquisition.