Do you think smiles make people look younger or older?

I mean the scrunch up your face and make you look odd.

I nearly bumped into a woman a couple of months ago as I came round a corner in the office, I said sorry and glanced at her as we passed – she was smiling. I saw her again around the office the next day and was surprised that she looked much older than I remembered her looking. Then I realised that it was because she was not smiling.

The anti ageing effect of her smile was confirmed today when I walked past and saw her smile again, she does look younger.

I don’t know if it has that effect on me.

I don’t smile quite as much as I used to.

Do you think (or has anyone told you) you look younger when you smile?

And why do we pull such an odd expression when we are happy?