Tech is a very broad term, it encompasses many domains e.g medicine, food, robotics, civil engineering etc. Not every website will cover everything. And even the technologists don't know what will be the next hit that will have profound impact on lives and when. One way to understand what could be on the horizon is to go through the company portfolios of major venture capital firms, read about research done by major universities, and follow few websites like Tech Crunch, The Register and Hacker News.
> My wife was just asking me how we should prepare for old age and what we should watch out for.
> One of my suggestions was making sure that we keep up with technology.
That is a good idea, but tech is a moving target. It will be difficult to keep track of it regularly.
What I would do, if I was in your place, is stop worrying about tech and instead think of what maximum places on this planet I could visit and start preparing for that. If you are in a western country, then I would urge you to visit those places that usually get bad press in the west, like countries in Asia, south America, middle-east, culturally vibrant countries like China and Iran, and countries in the Eurasian region. Just my 2cents :)