Watch out for aging. My mom spoke French and Spanish aside from English. As she aged, she reads both and doesn’t understand why we can’t read too. My wife has a patient that speaks five languages. Her husband speaks 3 of them. As the patient’s illness progresses, she starts talking in a random language. Sometimes she gets lucky and it’s one of 3 her husband speaks.
In Sweden there is very large minority of finns - many of the older ones forget Swedish and can only speak Finnish. (Or in some areas, actually never learned Swedish to begin with.) Hence the prevalence of nursing homes with the requirement to know Finnish to work there.
