Sincc 1982, a considerable number of results have been proved concerning the frequency of zeros of solutions of second-order equations having entire coefficients. The proofs of these results were peculiar to second-order equations since they used techniques which hold only for second -order equations(e.g. the differential equalion for the product of two solutions). Surprisingly, we show in the present paper that these results also hold for higher-urder equations. The prook are far different than in the second-order case being asymptotic in nature.