Dating a woman 15 years older than me, how can I tell it to my parents?

Anonymous
I'm 24 years old, she's 39 but looks much younger. Conversely, I look older, so we were both surprised to find out each other's actual age (I thought she was 30 or something and she thought I was older).
My parents are particular but laid back, yet I'm afraid they wouldn't approve of my relationship. Should I keep quiet, or introduce her to them? She'd like to be introduced to them, but says it's alright if I don't want to for now. I feel especially conscious about my mother's opinion, since she's barely two years older than her. But my father is 60, so I hope they'd approve because they too have a 20 years age difference...
Updates
+1 y
I was afraid for nothing, I told them and they are alright with it as long as I'm happy.
Thank you for the answers, tomorrow they'll meet her
Dating a woman 15 years older than me, how can I tell it to my parents?
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