@Thomas,
I was forty when I began studying to change careers (you know this already), and that took another batch of years, for which I'm not sorry. PQ, life can be more expansive than you seem to be thinking, and not just re land miles.
Not to knock your having that take on things - I remember a serious discussion with a friend when we were in our early twenties, her take being how she never wanted to live on Peach Street. Oddly, in the intervening time, though I was involved for a few years in housing tract design, I never heard of a street called Peach. I never thought I would live on one of those, being too peculiar or so I thought - thinking urban or shack but not tract - but now I live on the equivalent and, if I do not just love it, am absorbing the experience, one more in the layers.
To some extent, being trapped is in your mind, though this varies. I think the thing to worry about is the Peach Street of the mind, or whatever they would call that in England. I don't mean that re class, I'm not class oriented.
I think this is true even for people enmired in obligations they are in retrospect sorry for engaging, and people who can't just fly about for a lot of other reasons. The world is smaller now, even for those in a chair.