|Abstract||Objective: To measure the acoustic features of vowels and connected speech in male speakers between the ages of 20-49 using new cepstral/spectral measures (Fo, CPP, and CSID). Method: The software program Analysis of Dysphonia in Speech & Voice (ADSV-KayPentax) was used to analyze vowels and connected speech across three age groups: 20 to 29, 30 to 39, and 40 to 49. This resulted in three different ADSV measurements (Fo, cepstral peak, CSID) for the four different stimuli (vowels /i/ and /u/, CAPE-V Sentences, and The Rainbow Passage). Results: This study did not find significant differences in measurements of CPP, Fo, and CSID in the three age groups (20, 30, 40), nor in the interaction between the age group (20, 30, 40) and the speaking conditions (/i/, /u/, CAPE-V Sentence, Rainbow Passage). But there was a significant difference in measurements of CPP, Fo, and CSID in the four different speaking conditions (/i/, /u/, CAPE-V Sentence, Rainbow Passage). Conclusion: Results may be due to the use of cepstral/spectral measures, sample representation within each age group, sample size, or professional voice use in the current sample. Alternatively, there may not be a true difference between 20, 30, and 40 year-old speakers and the results of this study may accurately reflect reality. Future research is needed.