What makes them in Love?

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I am just curious, I can see many ladies marrying a man that is older that their father. And sometimes it is old as their grandfather, is it what they called love is blind? What makes them in love with that person that is older than their father, do their husband will also call their father Dad? How do their husband address their father in which their husband older than their father. If a 25 yrs. old lady will marry a 60 yrs old man is really love? Can she afford to kiss that person that is old as her grandfather?