If thirty is the new twenty, what does that make fifty? And, more importantly, what does it look like? Any woman wondering whether her date of birth dictates the way she dresses would do well to take some tips from former fashion editor Alyson Walsh. (She's 51, should that matter.)

Fifty isn't that old, she says. But the fashion industry sort of ignores you. It's changing now, but largely the photos are of young, thin people.

Walsh created the blog Thats Not My Age in her early forties. Now she's releasing a book, Style Forever: the Grown-Up Guide To Looking Fabulous, aimed squarely at those who are only as old as they feel. It€™s more celebration than it is fashion handbook, but consider it a sartorial manifesto for the age group she calls Generation FAB (Fifty And Beyond). And never use mutton and lamb in the same sentence ever again.

1. Wear what you feel good in. You know whether you€™'re comfortable or not.

By the time you reach this age, you have more confidence and you€™re aware of your body shape, so you know what suits,€ Walsh says.

2. Don€™'t chase trends, you can buy anything and wear what you like

It€™'s about looking modern, timeless and ageless. J.Crew€™'s Jenna Lyons and actress Robin Wright do it effortlessly.

3. Comfy shoes are a good thing.

€œI have the bunions to show for it,€ Walsh says. €œYour body changes and so do your feet. I suggest really good brogues or loafers €”but a pair of kitten heels from LK Bennett is fine too.€™

4. Don'€™t buy cheap clothes.

It doesn€™'t have to be Balenciaga or Saint Laurent, but don'€™t buy fast fashion that€™'s going to fall apart. Save up, buy less and buy better.

5. Spend money on a decent, tailored jacket.

The structure of it conceals any dreaded middle-aged spread, and it goes with everything. If you€™'re curvy or have big boobs, try semi-fitted styles; if you€™'re petite, a cropped, collarless number works. And choose a longer one if you want to cover your €œseat€. On the high street, Zara has a good selection.

6. Balance and proportion are key.

Loose tops look better with slimline trousers and skirts; wide-legs and A-lines need something more fitted.

7. Occasion wear is dead.

Walsh is adamant about this: €œI was going past Buckingham Palace one day after a garden party and I stopped in my tracks. Frills, ruffles and pastels make you look old. It€™s about simplifying things rather than piling everything on.€ Look for sharper feminine pieces, and never match your bag to your shoes.

8. But accessories are your friends.

”A sparkly necklace reflects light on to the face for a bit of Photoshop on the go, statement earrings work for day as well as night, and a bright scarf is a quick way to liven things up.

9. Don'€™t be afraid of colour.

€œIt€™'s important to perk things up a bit, because your complexion changes and your hair loses colour,€ Walsh says. €œI live in navy and khaki, but sometimes I€™ll add a bright orange T-shirt or something.€ Try COS for a cool and minimalist approach to introducing brighter shades.

10. But be careful with black.

It might be the fashion editor€™s favourite, but black can look severe over 50 €”especially if it€™'s next to your face. If you€™'re still nervous about going bright, try grey or blue instead.

11. You can do sexy.

But sexy isn€™'t really about looking sexy,€ Walsh clarifies, citing former French Vogue editor Carine Roitfeld as a FAB femme fatale. €œIt€™'s not overt, it€™'s subtle and strong. Not caring what men think is something that comes with age.€

12. Buy a silk shirt.

€œIt€™’s €˜go anywhere€™ style through the day and into the evening. I like Equipment and Winser London.€

13. You€™'re never too old for vintage or boho, see Tilda Swinton for inspiration.

But keep things simple, look for clean lines and make one garment (a coat, say) your statement piece.

14. Spend more time and money on an effective beauty regime, rather than buying every potion on offer.

Walsh recommends Decléor Aroma Cleanse, Aromatherapy Associates facial oils and Laura Mercier€™ Tinted Moisturiser with SPF. (Update your look with LFF video tutorials - Tricia)

15. For those of the €œnatural look€ make-up school, you€™ll need more of it than you used to.

€œWhen oestrogen leaves the house, the resulting slump in collagen production means that pores slacken too,€ says beauty writer Vicci Bentley. €œPrimer keeps make-up fresher for longer, and light-reflecting powders give skin a healthy glow.€ She recommends Dr Brandt for the former and Chanel for the latter €” and installing a magnifying mirror in your bathroom. (LFF Smooth Like Silk Face Prime is fabulous and costs less than Chanel - Tricia)

16. Treat yourself.

Buy French lingerie, and take your shirts to the dry cleaners rather than ironing them. You€™'ve earned it.

17. Get your underpinnings right: buy bras that offer support and won€™'t show up through your clothes €”and learn to replace them regularly.

A grey bra strap is a step too far,€ Walsh says. According to the experts at Rigby & Peller, if you wear a bra every day, the most you€™ll get from it is six months. Your breast tissue changes as you get older too, so look for soft-cup alternatives to underwires, and get yourself measured a couple of times a year.

18. Keep your hair in check.

Going grey is fine, but only if you€™re in charge of when it happens. Applying Color Wow'€™s Root Cover Up to roots will hide any stragglers until your next appointment.

19. Buy new things.

Aim for timeless classics, rather than stuck in a rut. €œYou should never stop experimenting,€ Walsh says. €œYou develop something of a uniform as you get older, but you should constantly be considering what€™s in your wardrobe€” and remember to keep editing it.€

20. Sunglasses can replace eye make-up on short shopping trips.

Come to think of it, if they'€™re big enough, your sunglasses can hide almost anything.Try some Anna Wintour bug-eyes on for size.

Style Forever by Alyson Walsh (Hardie Grant, £12.99 ), thatsnotmyage.com

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