Top Five Highest-Earning Celebrities Under Age 30.

1. Justin Bieber (20) - $80 million

Justin Bieber is mannaged to earn highest money 2014 under the age of 30s. He earned an estimated $80 million between June 2013 and 2014, most of that coming from the tail end of his tour.

2. One Direction (20-22) - $75 million

The boy band group One Direction managed to earn money US$ 75 millions, who placed second on the list. The young men of the U.K. celebrated the past year with their third studio album "Midnight Memories" that premiered at No. 1 on the Billboard 200.

3. Taylor Swift (24) - $64 million

Taylor Swift holds the honor as the highest-paid female celebrity on the list. The 24-year-old performer earned an estimated $64 million, a total she's sure to beat next year. Her album "1989" went platinum in its first week and Swift will kick off her world tour to promote the album starting May in Japan.

4. Bruno Mars (28) - $60 million

Bruno Mars and Rihanna rounded out the top five. The 28-year-old Mars earned $60 million thanks to his performance at the 2014 Super Bowl halftime show, which helped boost in his "Unorthodox Jukebox" album sales.