(** * Aging and operational steps *)

Lemma jsafeN__age_to {G C Z HH Sem Jspec ge ora q n} l jm :
ext_spec_stable age (JE_spec _ Jspec) ->
le n l ->
@jsafeN_ G Z C HH Sem Jspec ge n ora q jm ->
@jsafeN_ G Z C HH Sem Jspec ge n ora q (age_to l jm).