What is an average heart rate for a 27 year old man?

Depending on many other factors, a normal resting heart rate can vary between 62 to 80 (with fluctuations). Being overweight, unconditioned, under stress, in pain, etc. can increase a person's "normal" to 80 with little fluctuation, and can also shoot a heart rate up temporarily to 100 or a little higher. Being at ideal weight, condtioned and fit, people can influence the heart rate to stay lower consistently even when exercising.