Please don’t get sick of me being a yappster but I was looking at my last question and all of a sudden my brain just GAVE BIRTH to a question that’s just so random so behold my question :3
If your version of the ninja Turtles age swapped what would they look like? Lol I’m already imagining myself a mini Leo and a gigantic Mikey. 😀👍 
Again, please don’t get sick of my asks.😅
Though I do wonder am I the first person on your Tumblr page to ask the most questions because this is like my third :D
Nah, I'm not sick of your questions! I'm just... crazy busy with life outside the computer. XD But! Luckily, I got a gloriously-timed day off today, so I'm finally getting the opportunity I need to answer asks in my inbox! Like this one~
I had to think about your question a little before I began sketching. If I were to swap out each brother's age exactly-- going from youngest to oldest-- Then that would leave me with only Mikey and Leo's ages being changed since Donnie and Raph are twins. XD Sooo I decided to completely change each siblings' age.
First off, we have Chai and Rae-Rae.
At age 18, Chai is the kind of oldest brother that gives constant head noogies, as well as can not be trusted with any video games. (Since all his younger siblings know he will destroy every single high score they've earned). He's also the one to drag Tellie and Rae-Rae out of their rooms to go on adventures, whether they want to join or not. And if they kick and scream and complain, he'll remind them, (using song of course), that it's best to face every day with a smile. :) His little brothers seldom listen to his advice, which is... fair. At least his youngest brother looks up to him, always excited and ready for another adventure.
At age 10, Rae-Rae is constantly being bugged by his oldest brother. Being yanked out of his room to go on "adventures in the wild" are not his preference, especially when the "adventure" turns out to only be a grocery run. (Though the second youngest will admit it is normally a lot of fun to leap over buildings and climb rickety ladders). When he's not on a supply run with his obnoxious oldest sibling, he's found hanging out and drawing with Leo-- or Oni, as he nicknamed him after a particularly fascinating talk with their father about Japanese folklore. Rae-Rae found it hilarious to name his smallest, youngest brother after a fierce monster of legend. Even though Oni rambles until he's breathless, Rae-Rae has found that the youngest can listen...Barely... But he's best suited as a sparring partner.
Next, we have Tellie and Oni.
At age 13, Tellie is normally left back at the house to help Sensei watch over his youngest brother. This is a position he never asked for and never wanted, but it's forced him to grow a longer fuse when it comes to his temper. It's also made him better understand his father, and what it's like to help parent someone so young and curious and LOUD. When he's not busy keeping Oni away from sharp cutlery or getting electrocuted by a half-connected outlet, he's found hiding in his father's study reading one of the many mystical stories Splinter has collected. Sometimes, if his youngest brother keeps his mouth SHUT and LISTENS-- Tellie will read some of these interesting tales to get his baby brother to sleep. And when his father isn't available, Tellie is always going to be found playing video games with Chai. But he doesn't actually PLAY, he just helps guide and strategize.
At age 7, Oni is the biggest talker of the family, even beating out Chai. If you mention any of his favorite things, (which is a large variety of subjects), he will go on and on about what he's learned about it. His father is trying to get him to "sit and listen", but it's a slow-going process. Though he is getting better at sensing when one of his brothers are bored, (when their eyes start to separate or Tellie begins reaching for his bo), he still has a long ways to go in understanding the concept of a "conversation". When he's not being watched by his purple brother and father, he's found sitting and chilling with Rae-Rae, drawing or dancing as his red older brother tells him about his latest "mission" with Chai. Sometimes if he's lucky, Rae-Rae will wrestle with him to "help get energy out" before bed.
There ya go! :) This was a lot of fun to do, so I thank you for sending me such an interesting and unique question! And thank you for your patience!