AGES:
Peter: Sixteen (From chapter one to the second to last chapter), Seventeen (Last chapter and epilogue)
Lauren: Sixteen (From chapter one to the second to last chapter), Seventeen (Last chapter and epilogue)
Dani: Fourteen (From chapter one to the second to last chapter), Fifteen (Last chapter and epilogue)
Lisa: Twenty-One (From chapter one to the second to last chapter), Twenty-Two (Last chapter and epilogue)
Christina: Twenty-Four (From chapter one to the second to last chapter), Twenty-Five (Last chapter and epilogue)
Amy: Nineteen (From chapter one to the second to last chapter), Twenty (Last chapter and epilogue)
Katherine: Twenty (From chapter one to the second to last chapter), Twenty-One (Last chapter and epilogue)
Harry: Sixteen (From chapter one to the second to last chapter), Seventeen (Last chapter and epilogue)
Gwen: Sixteen (From chapter one to the third to last chapter)