User blog comment:Adventure Time Noob/Season 4 of Adventure Time confirmed!!!/@comment-4842283-20120227191238

Okay first of all remember the Adventure Time episodes "Prisoners of Love" were Ice King had all those princesses captured, well at that time LSP was 14 and in "The Eyes" she became 15 so Ice King would capture FP because she's 14 and any princesses that are 14+ and not capture princesses that are 13- shown when PB turned 13, and Ice King didn't care about her anymore. :)