Jacqueline,
Dressing with style and class is ageless, in fact it's often a sign of someone more mature. I have GG friends who are also of a certain age and they all continue to dress with style and grace and non of them look out of place when out socialising.
For me there's only one big mistake and that's to confuse dressing younger than your chronological age with dressing like a hooker but hey if that floats someone's boat that's their choice.