As Apple nears the 40th anniversary of one of its most groundbreaking products ever, the Macintosh, it is also a reminder to investors that the company that revolutionized the personal computer is now a middle-aged tech giant.Apple’s AAPL, +0.67% innovation and contribution to the history of personal computing is profound. The company, and the renegade team led by co-founder Steve Jobs, turned the PC into a machine that was actually personal, easier to use and more compact in size. The Macintosh included th ...