Place it immediately after the reveal in your edit, as the punchline beat, then follow it with Knuckles Oh No and Oh My God Wow to close the sequence, keeping the edit short so the age twist stays the focus.
Over dit geluid
This is a very short voice clip built around Metal Sonic, lasting about 1.6 seconds, with a clipped spoken delivery of the line in its title. The clipped, matter-of-fact tone makes the awkward age detail land harder, giving it a dry, uncomfortable humour that works best as a sudden reaction. It feels pointed, cheeky and deliberately out of place.