As a newb I'm low on credibility as far as the industry goes, but I would say you're not at all too old. I'm 44 and hoping to retire in about a year from law enforcement, take a 20 yr pension, and pursue professional flying so from that perspective I have some limited credibility as a fellow potential career changer.
I say go for it but make sure you okay with enduring the low wages and hectic schedules that will dominate your life for at least the first few years. Make sure your supportive family is informed.
Your wife, gf, or significant other should probably start researching things over on
http://www.jetgirls.net a support and answers site about life as a pro-pilot's family.