I’ll tell you where some of the poor nuns go who spent 60 or more years teaching in parochial schools.They worked for years probably assuming that the bishop who paid them $30 a month for their work would provide for them in their old age.
When that hasn’t happened they go to receive care from more affluent groups of nuns because their group has no money and cannot get social security. The bishops now have little money to care for them (or at least they say that) because of all the law suits.
Yes, that was an issue some years ago, that is why there is a big collection at the end of the year for retired religious, this is done at every parish. For many years now, Sisters have paid into Social Security.