Speaking to Elle, the Oscar-winner remarked that older actresses often aren't given roles of substance in mainstream films.
"There's a lot that's okay, but there's little that's really good, especially for someone my age," Paltrow said. "Sometimes you find out that something you really liked is going to someone 10 years younger."
She continued: "I find it heartening that Meryl Streep and Sandra Bullock have been able to find and create amazing projects."
The star also admitted that early on in her career, she was propositioned by "someone" that wanted sexual favours in return for her getting a film role.
"When I was just starting out, someone suggested that we finish a meeting in the bedroom'," she explained. "I left. I was pretty shocked. I could see how someone who didn't know better might worry, 'My career will be ruined if I don't give this guy a b**wjob'."
Paltrow will next appear with Tim McGraw in Country Strong, which is released on December 22 in US cinemas.