In the original novel by Leroux, she is around 20 years old. In the stage musical, the age is unkown. In the 2004 film version of the musical, she was 16, according to the tombstone in the end.
Some reports say California others say Nevada most likely California that's where she has lived pretty much during her " Price Is Right" career and after. Dian's DOB : 11/30/44, she is 66 years old ....