['My daughter recently finished potty training!', 'Awesome. How old is she?', "She is 2! I was happy to get this accomplished before she turned 3. My friends son is 3 and still isn't trained."]
Great to hear she's progressing well.  Maybe she'll be motivation for your friends son.
My daughter recently successfully potty trained and I was very proud of both her and myself for accomplishing this feat!