tedster - 3:33 am on Apr 8, 2013 (gmt 0)
3 months? 6 months? A year? What do you think the number is judging by your own experiences in building/ranking new websites?
If domain age is ever a direct factor (I also have doubts) that would not stop after any specific time period. As I see it, almost nothing in the algorithm works so mechanically these days.
In the past year I've worked with newly created domains that ranked well almost immediately. If there was any domain related trust factor there it was the OWNER of the domain - a well known brand.