if you've got the figure then age is irrelevant. Add a smile, the right underwear and some non-fugly shoes (all wrong on the model) and you are good to go.
no rules about tights, either - I think black sheer look very good.
however I'd shop around; the zip is too short and the dress is badly made, it is pulling on the right side of the picture. £10 primark job, not what they are charging.