I've seen your answer but I was going to say 26/27. The answers saying 40s are baffling to me.
But then people started explaining any types of lines and stuff that. I don't know what those specific types of wrinkles are and wouldn't think to look for them. That's why I have no idea what age I look. I've never noticed or cared to notice about lines.
But OP has an expression of someone in her late 20s and gives me that strong impression. I wouldn't have been surprised to hear 23 was the answer.