ABSTRACT
Although.each.of.us.is.familiar.with.inevitable.age-related.changes,.the.task.of.clearly.defining.the. term.aging..is.challenging..Aging.is.a.multifactorial.process.that.includes.both.intrinsic.and.extrinsic.factors..To.further.complicate.matters,.in.humans.the.term.can.be.considered.from.sociological,. physiological,.psychological,.and.molecular.perspectives.
