I am 15 years old and practicing to become an author. Please let me now what you think of this short story.?

Very very good, but like one poster said there's a bit too much purple prose in the beginning, meaning the description is a bit of an overkill. You want to set the scene not hit the reader over the head with it and ram it down their throats. Don't worry about using he or he's too much. In books on writing they say one of the mistake new writers is feeling the need to vary word like he or he said. Your story is written in the third person so it's logical that you would use the word he or he's a lot. I like the rest of the descriptions in the story, to me it felt just right. I could picture what was going on. I think your pacing is good to it doesn't take long to get lost in the story. The only other thing I would suggest is describing the old man's fear a little bit. Was he sweating? Was his heart racing? Things like that.