I'll echo the sentiment that you wouldn't be too old, but question your approach. Why get the degree at this point? Why not continue to learn through self-study and demonstrate your ability through open source?

Unless you want to be a bonafide computer scientist (i.e. working towards a career in academia or otherwise pushing the boundaries of current knowledge of the field), it seems like pursuing a second degree may do little else but exacerbate the age concerns you're already having.

In my opinion you'd be better off starting somewhere as a junior programmer now and honing your craft on the job (as you'd have to do after finishing your degree anyway).