If Cell Value Is Greater Than Another Cell Value By 2 Years - Highlight Red

I have a spreadsheet that records "Audit Date" in column C & "Audit Due Date" in column D. "Audit Due Date" is always 2 years from "Audit Date". I think I learnt the correct forumla to use =EDATE(C2,24). What I would like Excel to do is to highlight "Audit Due Date":

Red: If the audit was completed 1.5 years+ Amber: If the audit was completed between 1 & 1.5 years Green: If the audit was completed less than 1 year The colour key will show me which audits need chasing.