&gt; If you&#x27;re under 35, my advice would be to think about that. Do you really want to be locked into doing more or less what you&#x27;re doing now when you&#x27;re in your sixties? If not, now is the time to change. The later you leave it, the harder it will be.<p>Pause for thought indeed. Thank you.<p>My immediate response though was &quot;how can I predict jobs 20-30 years into the future, when I can&#x27;t even predict my field in 5-10 years?&quot;.  I could re-train, but most fields look like they will shrink.