Not saying this is nothing to be concerned about, but I think there's a little potential to read this way out of context. You won't see 78 million people retiring overnight.All told, 78 million people are going to stop working, stop paying taxes, stop paying into retirement programs, and start drawing benefits.
One of the problems with evaluating statistics when it comes to baby boomers is the fact that, while the start of the baby boom is pretty easy to identify, the end of the baby boom is less definite. Births peaked in 1957, so I suppose an argument could be made that that is the last year of the baby boom generation. I've also heard it extended until 1960 in some cases, and also 1964 (I suppose the rationale for the latter date is the fact that anyone born after 1964 conceivably could be the child of baby boomers; in any event, if you use that number, I'm one of the youngest baby boomers.) It wasn't until 1968 that births dropped below the 1946 numbers.
So the 78 million who will be retiring will happen over a 10-20 year period. A short enough period to be concerned, but not so short that it can't be accommodated with the proper planning.
Fwiw, I've already reconciled myself to the fact that I'll be working as long as my health permits.