You use Excalibur (The space ship in the mud), with the coordinates 56, 52.
get the missing page of mordreds jornal wich is under mordreds bed
mordred's missing journal is in his study. his missing page is under his bed.
It is under the bed in the place where you have to pay with the golden coin.
The Missing Journal Page tells you where you're going, but you need a spaceship to get there. The saucer Excalibur is crashed out in the mud past the Mill. (see related questions)
Jane and Alec's ages are not mentioned in the book or the movie.
There is still a missing page you may need. To find it, tie the rope to a big arrow at the castle crossbow. Shoot up and left to hit the door to the Princess tower. With the note from there, you can look under Mordred's bed at the Museum.
You need the letter from the Princess' bedroom to look under Mordred's bed in the Museum. But the missing journal page says that the Pewter Moon is at "56 52", which in the saucer is put in as X-56 Y-52.
The coordinates for the Pewter Moon are on the missing journal page (X-56 Y-52). Once the fuel rod is replaced in the saucer Excalibur, you can enter these coordinates into the launch computer. (see related question)
You can get a replacement for the broken one, but that's all the fuel you can gte for the saucer. The coordinates the Queen gave you are too far away. You should go to the moon at X-56 Y-52 as mentioned on the missing page of Mordred's journal. (see related questions)
The missing page is under his bed at the museum, and gives the coordinates for the Pewter Moon. The rest is just the island storyline.
The Missing Page - 1914 was released on: USA: 12 September 1914
Go to the nearby moon instead, at X-56 Y-52. (The coordinates are on the missing journal page.)