#4 Liv Morgan - 25 years old

Current SmackDown Live Superstar Liv Morgan made her main roster debut on an episode of SmackDown Live in November 2017 as a villain alongside Sarah Logan and Ruby Riott. Morgan was the youngest member of The Riott Squad and she is currently the youngest female Superstar currently competing on the main roster. In 2018, she was drafted to WWE's flagship show Monday Night Raw along with her Riott Squad stablemates. The team frequently lost their matches and they failed to make a big name for themselves on Raw.
After WrestleMania 35, Liv Morgan was drafted to SmackDown Live, the only member of the stable to move to the blue brand, which resulted in the group being disbanded. Morgan was absent from SmackDown for months before returning to the fallout episode of Extreme Rules where she lost to Charlotte Flair. The youngster was impressive in her match and a singles push for her is a much-needed move from WWE.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
#3 Toni Storm - 23 years old

Toni Storm is assigned to the NXT UK brand where she currently competes and is the reigning NXT UK Women's Champion. Storm is the second person to win the title and has the longest reign since the title's inception. She is also the first New Zealand-born singles champion in WWE.
She won the 2018 Mae Young Classic tournament at the Evolution PPV and defeated the inaugural NXT UK Women's Champion Rhea Ripley at NXT UK TakeOver: Blackpool to capture the title. She has done so much at such a young age.