Russia kept the tie in Wiener Neustadt alive courtesy of a five-set victory 7-6 (7-1) 6-7 (7-9) 7-5 3-6 4-6 by Nikolay Davydenko and Mikhail Youzhny over Alexander Peya and Olivier Marach to leave Austria 2-1 up with just Sunday's singles to play.
The study, by Josh Wiener and colleagues at the research firm RTI International, was based on a national survey that allowed them to follow thousands of people aged 50 and over for 10-12 years.
Vienna State Opera house - known as the Wiener Staatsoper - is one of the busiest opera houses in the world, producing 50 to 60 operas a year in approximately 200 performances.