Been using computers for more than 20 years. End result - not yet 40 years old but eyesight is already bad i.e. I got an eyesight of a person who is in his/her late 40s.

As for nabobo - I don't think so. That is, if you use computer time in a wise and balanced way, not just playing games for nearly 10 hours a day, 7 days a week.