According to Official Guinness Records,
The oldest croupier is Joanna Dodd (b. 15 January 1936, USA) who is still employed as a croupier at Flamingo Casino, Las Vegas, Nevada, USA as of 20 February 2015, making her the oldest croupier, aged 79 years 36 days. Joanna submitted her evidence on 20 February 2015, breaking the previous record by one day.
For a complete list of 2015 records, please visit 2015 Guinness Records in United States.