If a single older woman calls you 'darling' - what does it mean?

Anonymous
A divorced older 46-year old woman who I have been texting & who has previously said to me that I am a 'lovely attractive man' text me the other night & in the text she wrote 'aw, you are a gentleman, John darling.'

What did she mean by calling me 'darling'?

I'm a tall 23 year-old man.

If a single older woman calls you 'darling' - what does it mean?
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