At age 58, the Goo Goo Dolls singer is setting PRs and still hitting the high notes. by Jeff Tomko At age 58, John Rzeznik has no time to slack off, onstage or in the gym. The Goo Goo Dolls frontman still has plenty of music to create and thousands of fans to perform in front of, four decades since their debut album hit the charts in 1987. Most important, he needs to be his best version every day for his young daughter, who’s going needs her dad escorting her to school each morning for many more years. And appearance-wise, by looking at him onstage rocking a tank top as he bangs