you're never too old to learn to play
Just start off slowly, learn some scales (you don't need to use them or know the details of them, it's just good for practising finger movements and muscle memory and all that stuff.) Learn some basic chords and MOVEABLE positions (try to learn them in their regular state, then try inversions.) You can then move onto more advanced chords like 7ths, 9ths etc. Remember that pace is unimportant, concentrate on getting smooth, even scale movements and comfortable chord positions (make sure you fret all the notes properly; some positions are harder than others.)
Here is a nice site
http://www.all-guitar-chords.com/guitar_scales.php
If you want to practise a particular position first (this is probably best,) change pattern to 1 or 2, any key you wish, and the type of scale. I REALLY suggest learning the major and minor scales first as you'll be able to handle modes easily too, then move onto stuff like diminished and half-diminished and specialised scales like the pentatonic and bebop. If you are learning music too, stick with C at first for majors and A for minors because they don't have sharps or flats. Later on you can learn this stuff. Also, try and remember how to form major and minor chords with the interval formulas. Start off with major first ( Whole step, Whole step, Half Step, W, W, W, H)
Later on, you can set the pattern to full for improvising, it shows all the notes in the scale all over the fretboard.
