My late father-in-law, Jim, retired at 60 and spent the next 38 years pottering happily — gardening, grand-parenting and living life at a gentler pace. He represented the end of an era. For most people leaving work in their 50s or 60s today, the old model of work → stop → leisure  no longer fits. Many don’t want to retire — and most simply can’t afford to fund a life-stage that could last 40 years. Welcome to the age of ‘the 100-year life’,  the subject of a fascinating book