For a couple of reasons, the recent publication of the Credit Suisse Global Investment Returns Yearbook had me thinking about my kids. The first is personal. The report’s launch was hosted as usual by the bank’s research director who I first met after the birth of our daughters nearly 30 years ago. That’s only around a quarter of the 123 years now covered by this unmatched guide to the financial markets, but it’s long enough to have seen a few ups and downs and for both of us to have gained a few grey hairs.