Forty-nine old people are singing and dancing in the square, at least a few of them are the same.

49 ÷ 12 = 4 ... 1

So there are at least 4+1=5 people in the same month.

I hope I can help you. I use my mobile phone, and I can't get any questions or supplementary answers. Please send me a message if you have any questions ~ o (∩ _ ∩) o.