well a woman approaching 40 like you should realise the effect that would have

Yes rounding up a woman's age can definitely push a few buttons....especially if it's right there on the cusp of a milestone.
A 47 year old is likely to get a bit riled up if you say she's "pretty much 50" in my experiences.

Hiiii missingnotes :)

yeah, or say she looks like she weighs more than she does.

That's not a few... Shame on you.

Call her the "c" word.

Hah, true---if you know their real age. A young woman I worked with once snapped at me, "well, you're in your 40s, you old bat !" I was 52 at the time, so I was an even "older bat"---all I could do was laugh. 👵🏽

When she is giving you a blowjob, just tell her... Her sister swallows