Does HRV decrease with age in men?

HRV declines approximately 1–2 milliseconds per year in men after age 30, driven by progressive reduction in parasympathetic (vagal) tone, meaning average male RMSSD values are roughly 30% lower at age 50 than at age 25, and regular aerobic training can slow this decline significantly (Voss et al., Front Physiol, 2015).

The mechanism is well-characterized: as men age, baroreflex sensitivity (the sensitivity of the pressure receptors that regulate heart rate) declines. Testosterone, which supports autonomic tone, also declines. Visceral fat increases, driving low-grade inflammation that further suppresses parasympathetic activity. Sleep quality degrades, reducing the overnight recovery window during which the vagus nerve restores autonomic tone. The decline is real, but it is not fixed, men who train aerobically maintain higher HRV than sedentary age-matched peers by 10–20 ms on average.

Honesty Scale: Solid (1). The age-related decline in HRV is one of the most consistent findings in autonomic physiology literature.

What to do: Treat your HRV trend as a modifiable metric. Zone 2 aerobic training (150+ minutes per week at conversational pace) is the single most evidence-supported intervention for slowing age-related HRV decline. Alcohol, poor sleep, and excess stress training load accelerate it.

For the full picture, read Your Whoop Is Worried. Here Is What It Actually Found.