Conventional wisdom about generations says that the "Generation X"
(now twenty through late thirties)are less loyal to employers than
were baby boomers now in their 40's or 50's, and that (insofar as they
have any work history), the "Millenials" or "Generation Y" (the
youngest cohorts, (economically active members were born in the early
to mid 1980's)are even less "loyal."

The question is this: If conventional wisdom is valid, then there
would presumably be a higher rate of voluntary turnover among workers
in the Gen-X and Gen-Y age cohorts than in the Baby Boom cohorts.  I
need to sources that have analyzed hard data on this.

I will considere the question "closed" when you have found an anlysis
from a credible source containing a table or graph, or data from which
I can create a table or graph, that shows voluntary employment
turnover rates for a long periond of years, say 1970 to 2004 (or
something roughly that scope) broken down by age cohort, tracking
turnover rates within generations, particularly baby-boomers and
Generation X so that -- ans this is the key -- I can compare the
turnover rates of the two generations when they are the same age. 
I.e. I want to know turnover rates of Baby-boomers at several age
points (for example, 21, 25, 30, 35) to compare to Generation X'rs at
the same age.

Definitions: 
Baby Boom, born 1946 - 1964 (roughly)
Generation X, born 1965 - 1983 (roughly)