Basal body temperature

Chronological age is associated with basal body temperature in humans.

“We identified multiple associations between aging and menstrual metrics changes, including higher average temperatures, shorter cycles, and decrease in regularity across multiple metrics.”

Humansnonconceptive menstrual cyclesfemalesn = 753

Identifying menstrual metrics as personal health markers: Age trends and individual footprints in temperature across 5674 cycles

Science advances·20 May 2026