The document discusses several factors that influence second language acquisition: the social context, including the status of the first and second languages; the quantity and quality of second language input; the relationship between the first and second languages; age differences in learning capacity; individual aptitude; motivation; and instructional methods. Younger learners may have an advantage in achieving near-native competence due to brain plasticity and time to learn, while older learners' learning is affected by fewer cognitive advantages and less possibility of achieving native-like ability.