Age limit to use the gym on-board Epic?

Can anyone tell me if there is an age limit to use the gym on-board Epic?

The age policy on-board the Norwegian Epic does not allow anyone under the age of 16 to enter the fitness centre. This applies to all ships in the NCL fleet. To use the day spa, passengers must be aged 18 or over, which is the same age limit for the casino and the nightclub/disco on-board.