Changing Saved Game File? Monarch's Age or Heir's Age

Hi I am new to the Guild. This is my first post.

Is it possible to edit a saved game file? I want to either lower the monarch’s age or increase his heir’s age to 16. I have a great campaign going but my monarch died suddenly and his closest heir is only 10 years old. I really don’t want to use the saved game file from 16 years prior and use the .unfreeze. command so that I will have an heir in place when the king dies. Can anyone help me so I don't have to relive the past? I am playing the English and have conquered all of the British Isles, Scandinavia, All of Russia and am just about to lower the boom on the Turks. Going back 16 years would really be a hard pill to swallow!