Prime Timeline
   | Year | Event | 
   | 5 billion bc | 
       ● [1]
         The Guardian of Forever was asked its last question prior to 2267. [2] 
       ● [3]
         A female member of the Q continuum is born. She will later become romantically involved with Q. [4] | 
   
Colour key
● - Shows the canon status and reference of the year for this event
References
| # | Series | Season | Source | Comment | 
| 1 | TOS | 1 | The City on the Edge of Forever | The Guardian said it had been waiting for a question since "before your sun burned hot in space", indicating a time of at least five billion years ago | 
| 2 | TOS | 1 | The City on the Edge of Forever | The Guardian said it had been waiting for a question since "before your sun burned hot in space", indicating a time of at least five billion years ago | 
| 3 | VOY | 3 | The Q and the Grey | Q described Q's amarous intentions towards Janeway as being Tossed aside for someone five billion years younger. | 
| 4 | VOY | 3 | The Q and the Grey |  |