I don't think you can stop wrinkles from forming. They're a natural sign of ageing and after all, they are evidence that you have a laugh in life! :0)
However, you can't beat a good cleanse, tone, moisturise routine, and remember not to drag your under-eye moisturiser from your nose towards your outer eye. Just gently dab it from the outer eye inwards. This is delicate skin and it can easily be damaged.