What do I say to somebody who I know is lying about their age yet they talked about somebody else lying about their age?

I had to look her up to find out that she is significantly undercutting her actual age … but yet she told me that she was with somebody who gave her two different numbers for his age. I don’t like to be lied to. The real number is probably over what my line of comfort is, but still that’s not cool.

What do I say to somebody who I know is lying about their age yet they talked about somebody else lying about their age?
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