How's the battery life on that 10-year-old laptop?
The big improvement with modern laptops isn't compute power, it's energy efficiency and thus battery life, and also weight. Modern laptops are a lot easier to carry than 10-year-old models since they weigh a fraction as much.
Depends. I have a t430 that with the right distro last like 4 to 6 hours depending on usage.
It's a chunky laptop, but gets me going when I travel to a place where security can be iffy. So looks like an old VCR, and get less attention than an apple logo.