Bakit big deal sa mga babae na gusto ng guys in their 30s ang women in their 20s?

Bakit big deal sa mga babae na gusto ng guys in their 30s ang women in their 20s? Would you react the same way if it was a man in his 40s and a woman in his 30s? What if it was reversed? Women in their 30s and guy in their 20s? Would you still react the same way?