Wear a 1970s Look — at 50

What makes us orgasmically nostalgic — or is it nostalgically orgasmic? — whenever an oldie but goodie pops up as a “new” trend? This whole 1970s bohemian thing, for example: It gets my bateau bobbing because I’m still 35 — and holding! — in the fashion part of my brain. Are you concerned that a ’70s look might not be “age-appropriate” for you? Well, get over it, sez I, and then get on board: Staying relevant and looking contemporary may …