@Hlitner, you had a previous post comparing the dancing prowess of an elderly couple with that of a the Young Step Dancers.
We used to go to dances and get instruction from Jackie Horner who was still doing a mean tango well into her 80s. In case you have never heard of her (you probably have not), she was an advisor to the movie Dirty Dancing, and in fact the writer of the movie who the character Baby is based on was one of her dance students.
Here is a column written in remembrance of her after her death. She was a truly elegant lady, in the best sense of the word lady.
A remembrance of Jackie Horner, Catskills legend (recordonline.com)