7 years ago, I got to know a co-worker when I join the new team. Judging by his appearance, I would have guessed he is in his late 40s, very experience on technical matters.
After observing him at work, I realize he exhibited a few traits that normally was brought out when we get advanced in age: being absent minded about what colleagues tell you, being less responsive at work and just being slower than the others in producing the work.
I got a shock one day when one of my new co-worker told me he is just 35 years old. How can there be such a big difference in appearance, productivity?
Turns out, he had a rather nasty boss for some time and was pressurized aggressively. When he struggled with the things that he had to deliver, his boss just told him to do this and that, based ......