1. A biological information processing apparatus comprising: a pulse wave acquirer which acquires information about a pulse wave of a living body; a frequency analyzer which analyzes a frequency of the pulse wave based on the pulse wave information acquired by the pulse wave acquirer; a characteristic value extractor which extracts a characteristic value from the pulse wave frequency information obtained by the frequency analyzer; and a pulse wave property calculator which calculates a pulse wave property indicative of a functional state of blood vessels based on the characteristic value extracted by the characteristic value extractor; wherein the pulse wave property calculator carries out data conversion using predetermined conversion information with respect to the characteristic value to thereby calculate the pulse wave property indicative of an age of the blood vessels.