Someone who simps over younger people typically 3 or more years younger than them
"Jake is such a simp-ophile he likes younger girls, especially that girl named kenzie?"
"but isn't she 3 years younger than him"
"yes"
A "grand-master simp" is someone who makes simping their mastery, and tries to deny that they are a simp. typically that will be the head of simps in your friend group.
"Jake is the "grand-master simp" of our friend group"
"Yeah its a shame that he cant get a girlfriend "