What is perfect heart beat for a 40 years old man is?

For a 40-year-old man, a normal resting heart rate is generally between 60 to 100 beats per minute (bpm).

It's important to note that heart rate can vary from person to person and can be influenced by various factors such as fitness level, stress, and caffeine intake. If you have any concerns about your heart rate or overall health, it's always recommended to consult with a healthcare professional for personalized guidance and evaluation.