Many of Bernadette's youthful qualities are natural. Sure, she dyes her hair and wears makeup, but it's not like she's gone under the knife a dozen times. She eats right, exercises regularly, doesn't drink alcohol in excess, and leads an overall healthy lifestyle.
There's no rule that says someone who is 63 should look a certain way. Bernadette looks the way she does because, well, that's the way she looks. I certainly don't think she has an obsession with looking young. I do think, however, that she likes to look good, but there's nothing wrong with that. Bernadette's appearance is always very classy and refined.
Bernadette is a natural beauty. I don't think age needs to come into play.
"I'm the swell swab on the poop deck."