Thesesymptomsmayvaryperbodysite.
It hasbeenobservedthattheintrinsicagingprocessdiffersper
ethnic group(Davis andCallender,2011), probablycausedbythe
degree ofpigmentation,andpossiblymorenotyetidentifiedcon-
tributing factors.Skinthatisagedonlybyintrinsicfactorsdoes
actually notexist.Individualsthatlivestrictlyindooralltheirlife,
may haveacloseapproximationtothatskinstatus.Ingeneral,indi-
viduals carryskinthatreflectsvariousstagesofextrinsicaging,
superimposed onthelevelofintrinsicaging.