Things just aren't the same anymore since Leonardo had a stroke - undoubtedly a a side effect of the retromutagen ooze - and Donatello suffered mid-life crisis, bought a convertible and ditched his long-suffering wife April for a gold digger and ran down to Florida. Master Splinter, may he rest in peace, would've had a conniption, had he not been dead years ago.
Illustrator Gemma Correll (previously on Neatorama) envisioned a not-so-bright future for the Teenage Mutant Ninja Turtles in this comic panel, Middle Aged Mutant Ninja Turtles. MAMNT! Turtle power!