am I too old to learn the guitar/music? 
CyberFonic: Never too old!  If your wife is a decent muso, then why won't she give you shove in the right direction.  I play many instruments, and with your background, I'd suggest learning to read music and playing a keyboard would be an easier start.  Guitar is harder than it looks.  Assuming that you type reasonably well, then you already have the finger dexterity to play a keyboard reasonably well.Once you can play some bass lines, the two of you should be able to jam.  That in turn speeds up your learning and increases the motivation.Good Luck!