Okay information about the characters childhoods that I’ve been able to find out or figure out:
Casey: I have been in training since I was seven!
In the episode ‘How to Make Enemies and Bend People to Your Will’ Cassandra says she has been in training with the Foot since she was seven
Kendra: April! That’s your name right?
April: You’ve known me since kindergarten Kendra
In the episode ‘The Purple Jacket’ April says she & Kendra have known each other since kindergarten
According to the Rise book Ninja Power, April has known the Turtles for five years by the time the series starts meaning April met the turtles when she was 11, & Raph would have been 10, Donnie & Leo would have been 9 & Mikey would have been 8.
Leo: I say we let him go Raph, you went out on your own when you were his age
According to Leo in the episode ‘Hot Soup: The Game’, Raph has been going out to the surface by himself since he was at least 13
The Lair Games that happened in 2019 is said to be the sixth one which means they started in 2014 (meaning Raph was 11, Donnie & Leo were 10 & Mikey was 9)
In the episode ‘Lair Games’ Donnie is said to have been drawing his eyebrows on for nine years meaning he started when he was six
Donnie wore glasses during the first Lair Games but had stopped wearing glasses by the third Lair Games meaning he stopped wearing glasses between the ages 10-12
In the episode ‘Donnie vs Witchtown’ it’s shown that Donnie has been helping April with her science fair projects for at least three years meaning that Donnie’s has been helping April with her science fair projects since he was at least 12
Anyway, this animatic is my little gift of appreciation to the author of the fanfic. You all absolutely should check this out too :)
«Mutant Ninja Midlife Crisis» - https://archiveofourown.org/works/41619240/chapters/104393631
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Soft: RoughAnimator, ClipStudio Paint, Procreate, Paint Tool Sai, coffee, a lot of coffee…..
Song: That unwanted animal - The amazing devil https://youtu.be/VzHtfnCDASA