Zhou Yuwen met his mother-in-law in his previous life only after graduating from university, which means this life they met three years earlier. Pan Min hasn't even turned forty yet.
And Zhou Yuwen's actual age is over thirty, so subtracting and adding, they aren't too far apart in age, making their interactions as a single man and woman together a bit awkward for Zhou Yuwen.
Suddenly, he thought of something and said, "Oh right, Aunt Pan, shall we open the gifts first? Inside there's not only some clothes and sachets Su Qing bought for you but also some health supplements I brought you from abroad. Look, like this snow ginseng, it's great for nourishing yin and enhancing beauty, especially good for women."
As Zhou Yuwen spoke, he opened them to show Pan Min. Pan Min said, "I'm already a forty-year-old woman, what's the use of these?"