What is the secret of this love for wife???

Killer one :

Someone asked an old man:

"Even after 60 years, you still call your wife as Darling, mera baccha, sonu, jaan, janu, sweety, baby, Honey, Luvc.!!!! 

What is the secret of this love for wife??? 

Old man replied: 

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I forgot her name 10 yrs ago & 

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I'm scared to ask her.