Is a heart rate of 160 a healthy heart rate when exercising?

For your resting heart rate? Absolutely not. The normal RHR is 70-75 bpm. Anything above 100 bpm would be classified as a medical condition called Tachycardia. Are you sure you're measing your heart...

Depends on your age and what you're doing.

Heart rate is the number of heart beats recorded per minute. An average heart rate while exercising is measured while doing a workout. My body's heart rate decreases after an exercise which is called...

new born 120-160 beats per minute 0-5 months 90-140 beats per minute 6-12 months 80-140 beats per minute 1-3 years 80-130 beats per minute

Yes because for example when your running, your heart is beating faster and faster every minute maybe even every second.