How to design a longer life across multiple career and life stages

Executive overview

Most people still expect a three-stage life: education, work, retirement. For anyone likely to live past 90 or 100, that model is too rigid and financially untenable.

The shift is toward a multi-stage life — personalised sequences of work, learning, exploration, and portfolio living — where chronological age no longer predicts life stage. The critical assets for navigating this are intangible: productivity, vitality, and the capacity to transform.

The people who thrive in longer lives build diverse networks, practise intentional self-knowledge, and redesign careers around flexibility rather than lockstep milestones.

The end of the three-stage life

• Children born today in developed countries have a greater than 50% chance of living to 100.
• The traditional model — education → work → retirement — was built for lives ending at 75–80; it breaks down for 100-year lives.
• A rigid three-stage structure forces lockstep: everyone studies, works, and retires in sync. Multi-stage lives break that entirely.
• When 400 MBA students were asked to design their own lives, every single one chose a different path.
• New stages are emerging: portfolio living (multiple income streams), independent production, and deliberate exploration gaps at any age.

Three personas: Jack, Jimmy, and Jane

• Jack (born 1940s): lived the classic three-stage life, retired at 65, died at 75–80. The model worked for him.
• Jimmy (currently 40): started expecting Jack's path but is already extending it; lacks the savings to retire early and questions whether he wants to.
• Jane (20 years old): already planning for a multi-stage life, prioritising intangible assets — productivity, vitality, the ability to transform — over any fixed timeline.
• Cognitive decline accelerates when people retire without meaningful engagement; staying active in some form of work matters.

Age becomes irrelevant as a stage marker

• In a three-stage world, age predicted life stage precisely. In a multi-stage world, it tells you nothing.
• A 60-year-old may be back in education. A 40-year-old may be taking a gap year. A 23-year-old may already have a portfolio.
• As age groups mix across shared activities, age-based stereotyping diminishes — people are seen for what they do, not when they were born.
• Leaders should stop assuming talented people only enter organisations as fresh graduates.

What organisations must change

• Open hiring at any age, not just for graduates.
• Normalise sabbaticals — allow people to leave and return without career penalty.
• Build in flexibility across career spans: intense periods balanced with lighter phases for caregiving, learning, or rest.
• Most people can tolerate intense work in periods, but few want to sustain it uninterrupted into their late 70s.

The three intangible assets

• Productivity: networks of people with shared expertise who can mentor and challenge you — these make you better at your craft.
• Vitality: close, regenerative friendships maintained over decades; longevity research consistently links these to sustained health.
• Transformation: the capacity to reinvent yourself at transitions — requires both self-knowledge and diverse networks.

Why transitions are hard — and what helps

• People who know you best don't want you to change; if you change, they must confront their own choices.
• Homogeneous networks (same age, gender, education) actively resist change in their members.
• Diverse networks contain someone who resembles who you want to become — they model possibility.
• New jobs are rarely found through close friends (who know the same opportunities you do); they come via friends-of-friends whose networks don't overlap yours.
• Intentionality is required: the default is to socialise with people just like you. You have to actively choose otherwise.
• Age-diverse friendships are especially valuable — they provide models for who you might become at each stage.

The leader's inner and outer journey

• Trustworthy leaders close the gap between what they say and what they do; when that gap widens, trust collapses.
• The inner journey: understanding your own values, possible selves, and motivations — the foundation of authenticity.
• The outer journey: understanding the systems you operate in and the major trends shaping the world.
• Leaders who only pursue one without the other are incomplete — self-knowledge without systemic awareness, or systemic awareness without self-knowledge, both fail.
• Truth-telling is a leadership imperative; when leaders normalise dishonesty, institutional trust erodes and chaos follows.

Building the habit of learning across a long career

• Organise reading and research around a single animating question for a period of a year or more; filter everything through that lens.
• Periods of assimilation (wide reading, conversation, observation) alternate with periods of synthesis and writing.
• Breadth matters: financial press, academic work, and adjacent creative fields all contribute to original thinking.