Sodapop
The 1960's into the mid-70s saw high hiring with the advent of intercontinental flights (B747 etc) and the hiring of many ex-Vietnam era pilots (the very ones who are starting to retire which should create a strong need for pilots for the next 4-6 years).
From the "60s" to "the next 6 years", that's 57 years. Let's say 25 years old when hired by an "intercontinental" airline, it means the airline pilot will be 82 years old when he will retire... Forget either about the "60s", either about the "4-6 years from now", or maybe forget about both...
Vietnam war (1 million civilians/women/kids killed, rapped.. let's not forget): 1959/1975 (with most of the US troops removed BY 1973), From 1973 to "the next 6 years", that's 44 years... I guess most of the veterans have already retired, unless they all were 8 years old when they started the war... Don't count on them to produce a pilot shortage in the next 4-6 years...
The next 4-6 years? I would rather bet on a shortage of cheap fuel.
The looming pilot retirement is as "real" as the looming pilot shortage.