The aim of this research paper is to find out by comparing and contrasting between the adults and children in second language learning process how language ego of adult learners affects them to learn second language, and how it becomes a barrier for them in second language learning process. Nowadays learning English as foreign and second language is one of the most dominant socio-cultural requirements of people for seeking employment, foreign tour, business, education and other basic communicative purposes. Therefore, English as foreign and second language is definitely necessary for everybody because it is one of the most urgent socio-cultural pre-requisites of the Post-modern era. It is commonly observed during teaching and learning English as a foreign language in Pakistan, that language ego hinders the adults to learn it properly. Therefore, children are more successful L2 learners than the adults are. Children learning L2 use to reproduce construction process just as they do in their L1 learning and they have the ability to cognize and reproduce new and novel utterances. The compare and contrast between adult and child second language learner will be highlighted in this research paper, which may be helpful for teachers, researchers and scholars on the subject.