Knock on (meaning)

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'Good heavens, man, she's got a face like a hatchet!'
'They say that Queen Ezeriel of Klatch had a squint, but that didn't stop her having fourteen husbands, and that was only the official score. Besides, she's knocking on a bit...'
'I thought she'd been dead for two hundred years!'
'I'm talking about Lady Esmerelda.'
'So am I.'

This is a part of the conversation of two men about a woman (lady Esmeralda), who is said to be a famous courtesan. Source: "Masquerade" by Terry Pratchett.
What does "knock on" mean here?

I read something about "knock-on effects", but it doesn't seem to fit here.
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