I'm in my 40s and working the same enterprise programming gig since the late 90s. I keep up to date with doing work and learning on the side. I don't want to ma

I'm in my 40s and working the same enterprise programming gig since the late 90s. I keep up to date with doing work and learning on the side. I don't want to manage, not do to the people, but the red tape and politics. I do often wonder if I should leave and get another job before I appear 'too old'. The few interviews I've had over the past couple years my age didn't seem to be an issue, just weren't positions that would work out. At some point, if I choose to really leave or get let go, I'm rather worried that I will appear too old on paper to get my foot in the door, even though the knowledge and experiences should be there.