Before the latest hiring spree 75-80% of the Big 3's pilots will be retired in 15 yrs(2030). Add in five more years (2035) and it probably hits 90%. The retirees that got hired early in the wave will probably be large w/b CA's when the retire.
Spoke with a 44 yr old late 2014 newhire last week. His seniority number projects about 3 years as a 330/350/777/787 CA (junior base).