BICEP SIZE, DOES IT MATTER?

 

The size of your biceps reflects muscular health and function beyond just aesthetic appeal. Your biceps, formally known as the biceps brachii, are an upper arm muscle group with two heads originating from different parts of the shoulder blade and joining at one tendon attaching to the radius. 

Men

Age Average biceps size in inches

20–29 13.3

30–39 13.8

40–49 13.9

50–59 13.5

60–69 13.4

70–79 12.9

80+ 12.1

The biceps play key roles in flexing the elbow and rotating the forearm. Their size indicates the health and strength of these functions. Resistance training can increase biceps muscle mass.

Average biceps size changes with age and varies between men and women. For men, size peaks in the 20s-30s when testosterone levels maximize muscle growth potential. Gradual declines begin in the 40s-50s unless offset by training and activity. More noticeable reductions occur after age 60 as muscle fibers decline.  

Women

Age Average biceps size in inches

20–29 12.4

30–39 12.9

40–49 12.9

50–59 12.9

60–69 12.7

70–79 12.6

80+ 11.4

For women, average biceps size also relates to body composition and conditioning. Peak sizes occur in youth and adulthood depending on development and training. After age 30, focus tends to shift toward maintenance as hormones fluctuate and lifestyles change. Older women face more muscle mass challenges, making strength training essential for preserving biceps size.

In summary, your biceps size reflects muscular function and can indicate fitness levels based on age and gender-specific averages. Training and activity becomes increasingly important in middle and older age.