The Malaysian police came to know about the Turks after KL International Airport's (KLIA) officials arrested three men from the group on September 30 after they apparently attempted to sneak into the satellite terminal via the contact pier on Level 4 of the airport.
The arrests led authorities to detain 65 others, including 21 children, 18 women and 20 men, in the viewing gallery the same day, The Star reported.
All of them are now being investigated under the Immigration Act.
Police spokesman Zaldino Zaludin said apparently no one had noticed them as it was thought the group was transiting passengers.
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"They slept on cloth on the floor and bathed and changed in the toilets. At the airport, these things are a routine sight to us," said Zaludin.
"They had money with them. The viewing gallery is a very big place -- with toilets, prayer rooms and shops. If you have money, you can practically live there," he said, clarifying that the only crime committed by the group was overstaying in the country.
He said the oldest among those detained is 60 while the youngest is six months old.
Immigration Department director-general Aloyah Mamat said the area where the Turkish nationals were found was tagged as a "no man's land" although it was checked for squatters every night.
According to the newspaper, last year Ahmed Kanan, a 22-year-old Palestinian, had lived in KLIA's mezzanine floor for over 50 days without the knowledge of enforcement officers.