Sigh. Let the fatherly face-palming commence.
When recounting the story of how Destiny's Child started in the music industry, Matthew referenced a girl group led by singer Pink, saying she was "the exact same age as Beyonce." As Billboard pointed out, Pink is actually 36. That means, either Bey's had us fooled all this time or Mathew had a temporary case of parental forgetfulness (which is totally normal, TBH).
Seeing as how he later referred to Bey as being 34, we're going to assume that he had a momentary slip-up. After all, this is the man who groomed Beyonce into the musical deity that she is today, so numbers are definitely his strong suit.
However, if she did fudge her age by two years, she's only one of many celebs who've adopted a so-called "stage age." Regardless, we have a pretty good idea of how she feels about this age fiasco...