the old man is in a lab coat with a mustache

Prompt 1: an elderly man in a white lab coat with a stethoscope around his neck, standing in a laboratory and holding a test tube in his hand. he has a serious expression on his face and appears to be studying something on a table in front of him.

Prompt 2: depicts an elderly man in a white lab coat with a stethoscope around his neck standing in a laboratory. he has a serious expression on his face and is holding a test tube in his hand, appearing to study something on a table in front of him. the background of various scientific equipment and instruments in a laboratory setting. the man's hair is gray and he has a mustache.