Biru says, "If you two multiply your ages, the product is the year my mother's mother was born."
Cado says, "If you two multiply your ages, the product is the year my mother's mother's mother was born."
All Silovians know that no Silovian woman has ever given birth younger than 15 nor older than 45.
A fourth mathematician, Diba, arrives and says, "I heard your conversation, but I cannot determine any of your ages."
Adal says, "We all have different ages."
Diba says, "I still can't determine the age of any of you."
What is the most recent year that this convention could have been held?
