This may be the silly and stupid question but I have read that time appears to move slower near massive objects because the object's gravitational force bends space-time and the phenomenon is called gravitational time dilation means time moves slower as gravity increases but I want to know-how and concerning what time is calculated at a different position of space do time is calculated concerning earth time or any other and also since times moves slower as gravity increases this means what
Does our clock hand move slower there if so how since it depends on the mechanical property or it means ageing of the body?
Does it depend on the ageing of the body if so how since body ageing depends on the environment and natural things?
I have searched this type of question on the internet but I did not get a proper answer majority of the answer are based on theories and formula but I was looking for an intuitive and rigorous answer.
The intuitive and rigorous answer is highly appreciated.