The pace of change in some industries huge indeed. I'm an (old school) IT tech  and I reckon that my knowledge has a lifespan of about two years after which its obsolete. I started as an apprentce radio mechanic and fixed manual typewriters and ink duplicators (I reckon I could still overhaul and time a Gestetner machine), then golfball and electric machines, electronic typewriters and wet and dry first generation photocopiers.
From there I progressed to modern photocopiers and IBM XT and AT computers then had a career jump to Osborne Computers. I worked my way around the industry and worked with Digital Equipment Co, Compaq and HP, all at the same desk before moving to a Government job where I have had at least two careers, Storage and Cloud computing.
Of all the places I've worked the only company that still exists is HP and in a vastly different market to when I left.
All of this in a career that is still going after 36 years. Sometimes I wish I was in a trade where stuff doesn't change quite so fast but if you cant keep surfing that technology wave and then paddle back out before you get dumped its time to retire. 
Regards,
Tote
				
			 
			
		 
			
				
			
			
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