It entirely depends on the individual and their level of fitness. Mine is a low 44bpm. Winner of 5 Tour’s de France, Miguel Indurain, had a resting heart rate of 29bpm!
We were taught 60–100 for the normal resting heart rate (and according to this it still is accurate), but I believe the average is closer to 60–80 like @marinelife pointed out. People that are very athletic tend to have lower resting heart beats, as @meiosis pointed out.