what you say about that new research from Ahrefs "How long does it take to rank in Google?".
Everybody know almost "legendary" statement from Matt Cutts saying
"The difference between a 6 month old domain and a year old domain, is really not big at all".
I always been thinking that he just didn't express himself well that time and since that moment a lot of incorrect statements have appeared.
Now there we have a study which is pretty nicely showing that domain age is a crucial SEO factor for ranking especially for first 3 positions.