Trevor - Age and Freedom

Quote	Source
"- but nothing happened until I was eight. ... - they thought I might not be magic enough to come, you see. Great Uncle Algie was so pleased he bought me my toad."	Book 1, Page 125 Sorcerer's Stone, Chapter 7, "The Sorting Hat"
"What are you doing?" said a voice from the coner of the room. Neville appeared from behind an armchair, clutching Trevor the toad, who looked as though he'd been making another bid for freedom. ... He took a step forward and Neville dropped Trevor the toad, who leapt out of sight.	Book 1, Pages 272-273 Sorcerer's Stone, Chapter 16, "Through the Trapdoor"
Neville's toad was found lurking in a corner of the toilets;...	Book 1, Page 307 Sorcerer's Stone, Chapter 17, "The Man with Two Faces"
"Everyone gather 'round," said Snape, his black eyes glittering, "and watch what happens to Longbottom's toad. If he has managed to produce a Shrinking Solution, it will shrink to a tadpole. If, as I don't doubt, he has done it wrong, his toad is likely to be poisoned." The Gryffindors watched fearfully. The Slytherins looked excited. Snape picked up Trevor the toad in his left hand and dipped a small spoon into Neville's potion, which was now green. He trickled a few drops down Trevor's throat. There was a moment of hushed silence, in which Trevor gulped; then there was a small pop, and Trevor the tadpole was wriggling in Snape's palm. The Gryffindors burst into applause. Snape, looking sour, pulled a small bottle from the pocket of his robe, poured a few drops on top of Trevor, and he reappeared suddenly, fully grown.	Book 3, Page 128 Prisoner of Azkaban, Chapter 7, "The Boggart in the Wardrobe"
..."- oi, come back here, Trevor!" And he dived under the seat to retrieve his toad as it made one of its frequent bids for freedom.	Book 6, Page 137 Half-Blood Prince, Chapter 7, "The Slug Club"
PONDER THIS
"Look, Scabbers probably had a fight with another rat or something! He's been in my family for ages, right -" "Twelve years, in fact," said Lupin. "Didn't you ever wonder why he was living so long?"	Book 3, Page 363 Prisoner of Azkaban, Chapter 19, "The Servant of Lord Voldemort"

JKR Says Trevor is still lurking.