Renewing My Wedding Vowls Christmas Eve.

My husband and I are renewing our wedding vowls December 24, 2007, which is our 20th wedding anniversary. What color for an evening wedding should I wear. I am 60 years old, fair complected, strawberry blonde hair, which I wear shoulder length, and a very young looking 60 year old person. Is it proper for the dress to be a short, tea length, or can I wear a long dress, and can I wear a veil?