```ruby
task remove_old_personal_information: :environment do
  cutoff = Time.zone.now - 6.months
  Depersonalizer.new.remove_personal_information cutoff
end
```

Add namespace and description to rake task
user
```ruby
namespace :anonymise do
  desc 'Anonymise data that is at least 6 months old'
  task remove_old_personal_information: :environment do
    cutoff = Time.zone.now - 6.months
    Depersonalizer.new.remove_personal_information cutoff
  end
end
```
assistant