Here's a short story:

Several years ago, Kevin Stephan, then aged 11, was playing baseball when a player accidentally hit him with a bat. Kevin fell down and his heart stopped. Penny Brown, the mother of another player, was watching the game.Penny usually worked in the evenings as a nurse, but luckily that evening she wasn't working. Penny ran to helped Kevin and saved his life. Nearly seven years later, Kevin was washing up in the kitchen of the Hillview Restaurant in Buffalo, New York State. Normally, 18-year-old Kevin had school in the afternoon, but that week there were exams and he didn't have any class. At about 2 p.m., Penny Brown was having lunch with her family in the restaurant. She was eating when some food got stuck in her throat. She was very frightened because she couldn't breathe. Kevin was a volunteer firefighter in his free time and he ran to help. A waitress tried to help her, but the food was still stuck in Penny's throat. Kevin pulled his hands quickly into her stomach and saved Penny's life. He didn't know it was Penny, but his mother, Lorraine Stephan, was also having lunch in the restaurant. She realized that Penny was the woman who saved Kevin's life, seven years before, at the baseball game. Both Penny and Kevin were completely amazed by the coincidence ! (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What did Penny Brown do for a living?
Guess: she was a nurse

Question: Who's life did she save?
Guess: Kevin Stephan

Question: How old was he then?
Guess: 11

Question: Why did he fall down?
Guess: a player hit him with a bat.

Question: What happened when he fell down?
Guess: his heart stopped.

Question: Where was Kevin washing up years later?
Guess: in the kitchen of the Hillview Restaurant

Question: How old was he then?
Guess: 18

Question: Why wasn't he in school?
Guess: there were exams and he didn't have any class

Question: What did he volunteer at in his free time?
Guess: as a firefighter

Question: Who else was having lunch with her family there?
Guess: Penny Brown

Question: What happened to her?
Guess: some food got stuck in her throat

Question: Who tried helping at first?
Guess: A waitress

Question: Did Kevin know who he was helping?
Guess: no

Question: Was his mother's name Tonya Stephan?
Guess: no

Question: What was it?
Guess: Lorraine Stephan

Now answer the following question in the same format.

Question: How many years ago did Penny save Kevin's life?

seven