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There's no clear dividing line between a person aged 17 and one aged 18. However, before puberty, the human body has significant differences in the release of hormones.

The primary hormone which stimulates puberty is the Gonadotropin-releasing hormone.

GnRH is a neuro-hormone and stimulates certain behaviour patterns, the hormone influences a person's physiology. It is therefore not unreasonable that a certain compound for which GnRH acts as a catalyst can cause dangerous and even deadly effects on only those with a significant amount of GnRH (in short, everyone who is going through puberty would die first, and then all those who already have done that).

Another possibility is a microbe which binds with one of these hormones as a way of infecting its host.

This could kill overoff everyone over 13 (except for those who present with Isolated gonadotropin-releasing hormone deficiency). Four years later, the 13 year olds will be 17.

There's no clear dividing line between a person aged 17 and one aged 18. However, before puberty, the human body has significant differences in the release of hormones.

The primary hormone which stimulates puberty is the Gonadotropin-releasing hormone.

GnRH is a neuro-hormone and stimulates certain behaviour patterns, the hormone influences a person's physiology. It is therefore not unreasonable that a certain compound for which GnRH acts as a catalyst can cause dangerous and even deadly effects on only those with a significant amount of GnRH (in short, everyone who is going through puberty would die first, and then all those who already have done that).

Another possibility is a microbe which binds with one of these hormones as a way of infecting its host.

This could kill over everyone over 13 (except for those who present with Isolated gonadotropin-releasing hormone deficiency). Four years later, the 13 year olds will be 17.

There's no clear dividing line between a person aged 17 and one aged 18. However, before puberty, the human body has significant differences in the release of hormones.

The primary hormone which stimulates puberty is the Gonadotropin-releasing hormone.

GnRH is a neuro-hormone and stimulates certain behaviour patterns, the hormone influences a person's physiology. It is therefore not unreasonable that a certain compound for which GnRH acts as a catalyst can cause dangerous and even deadly effects on only those with a significant amount of GnRH (in short, everyone who is going through puberty would die first, and then all those who already have done that).

Another possibility is a microbe which binds with one of these hormones as a way of infecting its host.

This could kill off everyone over 13 (except for those who present with Isolated gonadotropin-releasing hormone deficiency). Four years later, the 13 year olds will be 17.

1
source | link

There's no clear dividing line between a person aged 17 and one aged 18. However, before puberty, the human body has significant differences in the release of hormones.

The primary hormone which stimulates puberty is the Gonadotropin-releasing hormone.

GnRH is a neuro-hormone and stimulates certain behaviour patterns, the hormone influences a person's physiology. It is therefore not unreasonable that a certain compound for which GnRH acts as a catalyst can cause dangerous and even deadly effects on only those with a significant amount of GnRH (in short, everyone who is going through puberty would die first, and then all those who already have done that).

Another possibility is a microbe which binds with one of these hormones as a way of infecting its host.

This could kill over everyone over 13 (except for those who present with Isolated gonadotropin-releasing hormone deficiency). Four years later, the 13 year olds will be 17.