adjective

unimportant under the circumstances; irrelevant.

the difference in our ages is immaterial

irrelevant,unimportant,inconsequential,insignificant,of no matter/moment,of little account,beside the point,not to the point,neither here nor there,inapposite,not pertinent,not germane,trivial,trifling,petty,superficial,peripheral,tangential,extraneous