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- phenomenon of forgetting langauge is interesting for linguists
- loss of langauge in individuals as in whole speech communities
- maybe medical reasons (dementia, aphasia)

- immediate loss of language attrition starts after stopping to use it
- 2 years of stable proficiency
- retrieval of an acquired language is easier than acquireing a new
- lexis is more affected by language attririon than grammar

- critical threshold (age), younger learner have less difficulty to
  acquire a language, but attrite it faster
- same for beginner and advanced learner