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The Age Rebellion

Supercharge the Second Half of Your Life

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Read the First Chapter

Why this Book Matters – to People, and to Business

Lyndsey Simpson, CEO & Founder of 55/Redefined, wrote this book to challenge one of the most deeply embedded and commercially damaging assumptions in modern working life: that our value declines with age.

This is not a lifestyle book dressed up as business thinking. Nor is it a rallying cry without substance. The Age Rebellion is a data-informed, action-oriented framework for rethinking longevity. Whether you're looking to redefine your own life or are a business leader who wants to understand the here-and-now growth opportunity of our ageing society, this book will irrevocably change the way you think about age.

Early Reviews of The Age Rebellion

  • 'Few things are as important now as how you age and what to do with those extra years that longer lives bring. This book will make you think hard about what you want to do and how to do it. Whatever your age you have more years ahead of you than past generations and need to age differently. Its time to join the age rebellion.'

    Professor Andrew Scott CBE
    Professor Andrew Scott CBE
    Author of The Longevity Imperative and The 100 Year Life

  • ‘As Shakespeare might have said, “To retire or not to retire that is the question”! Lyndsey Simpson’s book is the perfect primer for answering that question –and more importantly what to do about it! At age 91, it even gave me some new ideas!’

    Alan Patricof
    Alan Patricof
    American Venture Capital Investor​

  • 'Retirement bad! Living good! Refreshingly salty, unapologetically un-woo-woo, and totally inspirational.'

    Ben Miller
    Ben Miller
    Actor, comedian and bestselling author

  • 'At 50, I feel more energised, more curious and more driven by purpose than at any other time - and The Age Rebellion explains exactly why. Ikigai has taught me that meaning deepens with age, and this book gives us the roadmap to design a future that matches that truth. It tears up the old rulebook on "retirement" and helps you plan for the extra 30 years modern life now offers. A brilliant guide for anyone ready to rewrite what comes next.'

    Sam Smith
    Sam Smith
    Founder of finnCap/Cavendish Financial and co-founder of SuperScalers, author of The Secret Sauce

  • ‘We’ve won the longevity lottery, yet we’re still living by a life script written for much shorter lives. Age Rebellion is a sharp, unsentimental wake-up call for anyone who suspects the problem isn’t ageing, but outdated assumptions about it. With clarity, evidence, and just the right edge, this book exposes how early we sideline experience, ambition, and relevance - and why that’s a colossal waste of human potential. This isn’t about ageing gracefully or embracing retirement chic. It’s about rewriting the rules for work, identity, and purpose across a 100-year life. Smart, timely, and quietly radical.’

    Avivah Wittenberg-Cox
    CEO, 20-first and Host 4-Quarter Lives Podcast

  • 'Essential and timely: we're likely to live longer than we think, The Age Rebellion is your essential guide to cracking the 100 year life.'

    Eleanor Mills
    Eleanor Mills
    Founder of Noon.org.uk and author of Times Bestseller Much More to Come

  • 'The Age Rebellion is a roadmap for the New Longevity era. As we all live longer lives, how do we design a life that will have meaning and purpose? In this must-read, Simpson reports on how individuals, businesses and society can create a new template for today and future generations that may live to 100!'

    Michael Clinton
    Michael Clinton
    Founder & CEO of ROAR forward and author of ROAR and Longevity Nation

  • 'Attitudes towards careers and age pose a big problem for the progress of individuals, organisations and society. Lyndsey tackles the problem head on, sharing insights and expertise to drive much needed change. The Age Rebellion is an important read that changes the way people think about their career over the long term.'

    Helen Tupper
    Helen Tupper
    Author of The Squiggly Career and Learn Like a Lobster

What The Age Rebellion Is Really About

At its core, The Age Rebellion argues that the traditional retirement model is no longer fit for purpose – for individuals, organisations, or the economy. We’re living longer, healthier lives, yet the structures around work, careers and contribution haven’t caught up.

The book reframes later life not as a wind‑down, but as a second (or third) act defined by experience, relevance and choice. It explores:

  • Why delaying retirement and staying engaged is linked to better health outcomes and longer lives
  • How outdated career models are creating cliff edges, not glidepaths, for experienced talent
  • Why over‑50s represent one of the most overlooked economic opportunities of our time
  • How purpose, not money alone, drives fulfilment and performance in longer lives

Why This Book Matters to Business Leaders

For employers, The Age Rebellion lands at a critical moment.

Across markets, organisations are facing skills shortages, retention challenges and a shrinking pipeline of younger workers. At the same time, vast numbers of highly experienced employees are exiting the workforce earlier than they need – or want – to.

Lyndsey’s argument is simple and uncompromising: “If you don’t have an age strategy, you don’t have a growth strategy.”

The book connects individual longevity with organisational performance, making the case that:

• Experience is a competitive advantage, not a cost

• Age-diverse teams deliver stronger outcomes

• Customers are ageing faster than most workforces that serve them

• The real return on investment is Return on Experience (ROE)

For HR leaders, CEOs and boards, The Age Rebellion provides the context behind why age inclusion has moved from “nice to have” to business-critical – and why doing nothing is no longer neutral.

A Personal Read – With Professional Consequences

What makes The Age Rebellion resonate is that it speaks to two audiences at once.

On a personal level, it challenges readers to rethink how they plan the decades ahead, asking hard questions about identity, purpose and contribution beyond midlife. It encourages readers to design a life they never want to retire from, rather than defaulting to an outdated script.

On a professional level, it forces leaders to confront how their organisations define value, progression and potential – and whether they are unintentionally designing experienced people out of the system.

Once you see the implications, as Lyndsey puts it, you can’t unsee them.

About the Author

Lyndsey Simpson is CEO and founder of 55/Redefined and a leading voice on age, work and longevity. Through her work with global organisations across financial services, retail, technology and consumer brands, she has helped businesses redefine work for the 100-year life.

She is widely quoted in the business press and known for calling out uncomfortable truths – always backed by data, and always with a solution.

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