The fastest way to look old is to try to look young I was informed, so I could not agree more with most of the comments here. When I was a young mum living in London, I walked behind a girl with a slim and dainty figure, long curls flowing , and a rather 'sweet' little dress tied at the back with a bow. I thought she must be about twenty at most, but when I saw her face I almost fell back with a scream. She was haggard and wrinkled, and she must have caused a similar shock to a lot of people. Given that she was slim and had good hair, had she dressed appropriately she could have looked really good instead of alarming.
A smile is so important, being scrupulously clean and fresh in person and clothing, a good haircut, and by now hopefully we know what suits us in terms of colouring and style. The single biggest asset that I believe keeps anyone looking and feeling young is a happy heart.