I don't have regrets because they are negative.
That to me was the most poignant part of Diana's wedding; as she was walking up the aisle and her eyes were going left to right, looking at people and smiling in the way that Diana did - and that diamond tiara glittering like mad. It was great.
Don't take things too seriously.
Stay small and control it yourself.
Never cut corners, or accept anything that's second-rate.
I can think of a lot of women clients of mine who are well into their 50s or 60s who are still quintessentially very elegant.