When guy and gals in college ask about time to majors, I say if you have your hours to get hired by a regional shortly after you graduate college, you have a good likelihood of going to a major by about age 30.
Until just a few years ago a lot of folks age 50 were still waiting to get that call.
That is about as close as I am going to say.
A couple of years one way or the other, while we debate here, is a small difference compared to where the industry has been.