In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. There are several possible answers, you'll need to choose the proper one. Carefully read the given text, pay special attention to the marked number, think about what (unwritten) information the marked number holds inside, choose the most adequate word(s) from the optional answers. If none of them seems right to you, there's also an option for other. If your answer is "REFERENCE", also write the reference entity, otherwise write the implicit option name. Options to choose from are:
REFERENCE: Some object which is being mentioned in the text before or after the target number. The reference answer has a higher priority than any other. If both Reference and another answer are possible, prioritize the Reference.
YEAR: Describing a calendric year
AGE: Describing someone's age
CURRENCY: Reference to some monetary value e.g dollar, euro etc.
PEOPLE: Describing a single/plural persons
TIME: Describing a time of the day. Usually you can add the word o'clock after those numbers.
OTHER: Some other option, which isn't listed here.

Let me give you an example: Jess Mastriani: No, I don't want another crooler, thank you very much.
 FBI Agent Nicole Scott: But it's good for you. It's got... honeyglaze. Please die for this crooler, Jess.
 Jess Mastriani: I've had _ two _ already. Who eats three croolers in a night? 
FBI Agent Nicole Scott: Take a look. [Nicole takes a huge bite] Mmmmm, Mmmmm, Mmmmm!
The answer to this example can be: REFERENCE crooler
Here is why: In this example, the number two refers to something that appears in this text. In this example, it refers to the word: crooler.

OK. solve this:
Ichigo Morino:  So , Do you have the same problem ?
Kei Kusanagi: Yes ... I first had it when I was _ fifteen _ ... I " standed " three years . Now , I 'm eighteen , And You ?
Ichigo Morino: Twenty - one , I was " standed " for six years . Surprised ?
Kei Kusanagi: A little ... and I did not know that side of you ... I was surprised . Do you live here by yourself ?
Kei Kusanagi: Yes
Kei Kusanagi: For the disease ?
Ichigo Morino: Is there some other reason ? Ah , yes ... that 's why you live with your aunt and uncle ...
Kei Kusanagi: That does not mean my parents did not worry about me , but ... I 'm like a burden to them ... So I came to live with my uncle who is a doctor .
Ichigo Morino: It happens , more or less the same thing to me
Kei Kusanagi: I see ...
Kei Kusanagi: Yes
Kei Kusanagi: Morino , you were concerned about Herikawa and I ... that 's Why ... You did n't want to stop , right ?
Ichigo Morino: Sorry .
Kei Kusanagi: No , no need to apologize ... six years ... It 's Twice than me ... a long time !
Ichigo Morino: Do n't say it like it 's normal !
Kei Kusanagi: I 'm sorry .
Ichigo Morino: My sister is a year younger and she 's already married , she will be mother the next year ... I ... I do n't want to stop . I 'm sorry I involved in this . I understand it 's not your fault ... but I ... I ...
Kei Kusanagi: I do n't want to " stand " ... still .
Answer:
AGE