by / until

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. My passport is expiring by 12th May 2015.
  2. My passport is valid until 12th May 2015.
  3. She studied medicine by the age of 25.
  4. She studied medicine until the age of 25.
    Please correct the above sentences.
    Thanks.
2
  1. My passport expies on 12th May 2015.
  2. My passport is valid until 12th May 2015.
  3. She studied medicine until the age of 25.
  4. She studied medicine until the age of 25.