Artist's commentary
Touhou 4Koma #1616: Turf War
Fighting like that is their speciality (though I'm not saying they're strong).
Poll: Who's older, Reimu or Marisa?
• Reimu's older
• Marisa's older
• They're the same age
• Since there's no concept of age in Gensoukyou, they're as old as Yukari-san