PARIS — The Paris Opera usually invites only journalists to the news conferences where it unveils its coming plans. But last month, as it announced a boldly ambitious 2018-19 season, the company brought in 200 people under the age of 28 to the event at the Palais Garnier here.

This was not just for show. It was a dramatic way of highlighting the Paris Opera’s extraordinary success in attracting younger audiences. According to the company, it had 95,000 audience members younger than 28 last season — more than 10 percent of tickets sold and 30,000 more than just two years before.

The company, which celebrates its 350th birthday next year, is an unlikely contradiction to the worldwide trend of an aging audience at operas. The average age of an audience member in Paris is 45 — 48 for the opera, 43 for the ballet — compared with 58 at the Metropolitan Opera and 54 at the Staatsoper in Berlin. The largest segment of the Houston Grand Opera’s audience is between 65 and 72.

When Stéphane Lissner was appointed as the Paris Opera’s general director in 2014, he set about implementing measures focused on fostering younger attendance.