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Average Total and Free Testosterone Levels in Men by Age Group
Two studies of Sex Hormone Levels in men, by age group (1)        
Mean Plasma Sex Hormone Level in healthy men (2)    
Measurements in European Units (nmol/L)  
Age Number of Subjects Total Testosterone Standard Deviation Free Testosterone Standard Deviation SHBG Standard Deviation
25-34 45 21.38 5.9 0.428 0.098 35.5 8.8  
35-44 22 23.14 7.36 0.356 0.043 40.1 7.9  
45-54 23 21.02 7.37 0.314 0.075 44.6 8.2  
55-64 43 19.49 6.75 0.288 0.073 45.5 8.8  
65-74 47 18.15 6.83 0.239 0.078 48.7 14.2  
75-84 48 16.32 5.85 0.207 0.081 51 22.7  
85-100 21 13.05 4.63 0.186 0.08 65.9 22.8  
     
Testosterone measurements converted to ng/dl  
Age Number of Subjects Total Testosterone Standard Deviation Free Testosterone Standard Deviation SHBG (nmol/L.) Standard Deviation
25-34 45 617 170 12.3 2.8 35.5 8.8  
35-44 22 668 212 10.3 1.2 40.1 7.9  
45-54 23 606 213 9.1 2.2 44.6 8.2  
55-64 43 562 195 8.3 2.1 45.5 8.8  
65-74 47 524 197 6.9 2.3 48.7 14.2  
75-84 48 471 169 6 2.3 51 22.7  
85-100 21 376 134 5.4 2.3 65.9 22.8  
     
Plasma Total Testosterone in healthy non-diabetic men (3)      
Measurements in European Units (nmol/L)  
Age Number of Subjects Mean Standard Deviation Median 5th Percentile 10th Percentile 95th Percentile
< 25 125 23.97 5.48 24.15 14.15 16.22 33.12  
25-29 354 23.18 7.14 22.08 13.46 15.18 34.84  
30-34 330 21.53 6.72 20.7 12.07 13.46 33.81  
35-39 212 20.7 6.55 19.66 11.39 13.46 32.77  
40-44 148 20.7 6.87 20.7 11.04 13.11 32.43  
45-49 154 18.91 5.66 18.28 11.39 12.42 29.32  
50-54 164 18.87 6.49 17.94 10.01 12.07 32.43  
55-59 155 19.14 6.04 18.97 11.04 11.73 30.01  
     
Measurements converted to ng/dl  
Age Number of Subjects Mean Standard Deviation Median 5th Percentile 10th Percentile 95th Percentile
< 25 125 692 158 697 408 468 956  
25-29 354 669 206 637 388 438 1005  
30-34 330 621 194 597 348 388 975  
35-39 212 597 189 567 329 388 945  
40-44 148 597 198 597 319 378 936  
45-49 154 546 163 527 329 358 846  
50-54 164 544 187 518 289 348 936  
55-59 155 552 174 547 319 338 866  
1 - Source for charts: http://www.weymouthclinic.co.uk/wellman/paper2.html    
2 - Vermeulen A. Declining androgens with age - an overview, In: Androgens and the ageing male. Eds. Oddens B. Vermeulen A. Parthenon Publishing. New York. 1996
3 - Simon D. Nahoul K. Chades MA. Sex hormones, ageing, ethnicity and insulin sensitivity in men : an overview of the Telecom study. In: Androgens and the ageing male. Eds. Oddens B. Vermeulen A. Parthenon Publishing. New York. 1996
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