Men’s reactions are at their zenith at age 39

A new study suggests that men’s brain’s ability to respond to external stimuli reaches its zenith at age 39, and starts declining thereafter. During the study, the scientists asked 72 men between 23 to 80 years to tap their index fingers as fast as they could for 10 seconds and measured the amount of myelin a fatty sheath of insulation that coats nerve axons and allows for signalling bursts in our brains.