Hello sir. Please mention where is the pain
exactly and in which position and action you feel the pain. It could be various possibilities. Whether you had a fall or injury or jerk or have you been working over for a long time or did you play any sport after a long time. Considering your age - it could Peri-arthritis or Frozen Shoulder
for which you need physio and regular exercises so that ranges r maintained and joint remains in a stable position. Thanks n take care.