Xers are usually 65-80.
Besides, taking a mere 16 years (1965-80) as a defineable "generation" is pretty silly anyway. I would think a person born in 1963 ("Boomer") would have more in common with someone born in 1967 ("Xer") than with someone born in 1948 ("Boomer"), who in turn would have more in common with someone born in 1943 (pre-boomer).
The whole notion of these artificially demarcated, brief "generations," that they each have their own distinctive, monolithic values, shared by all in that age cohort and different from those before or those after--I find the notion silly.