Simplify the following text for a Grade 5 native English-speaking person.
Original: As of 1999 , the dates of 31 samples from the cave had been reported , with the earliest being 32,900 Â 490 BP .
Simplified: As of 1999 , the dates of 31 samples from the cave had been reported . The earliest , sample Gifa 99776 from `` zone 10 '' , dates to 32,900 Â 490 BP .