With some frugality and smart money management, you can retire in 5-10 years if you're on a dev salary.
No employer is going to pay you 3x what your nearest peer is willing to live on.
I can't retire and never have to work again, but I'm slowing down a bit, and spending more time not earning money (gym, reading, travel, etc).
On second though, if I absolutely needed to, we could probably 'retire' tomorrow, and do a bit more belt-tightening - savings/investments would last probably another 10-12 years without any major changes to lifestyle, then could collect social security. But that's... not something I want to do. I like doing most of what I'm doing, and am just being a bit choosier about what I do now.
EDIT: no kids, semi-rural southern US.
EDIT 2: Moderately high, but irregular, income from consulting/contract dev/tech work. Not W2.
Here in the UK, after tax, $50K/yr doesn't even cover my mortgage, and I live in a house that over 100 years ago, according to the 1911 census, supported a family of 5 on a carriage drivers single income.
I earn a top 1% salary as a dev and retirement will still be 20-25 years away for me under ideal conditions - i.e. a 40% savings rate.
That's very easy if you don't have kids - just don't get on a hedonic threadmill (and, if you're already on it, start gradually getting off). I'm not a parent myself, so won't speak about the "with kids" situation.
The average Londoner is paying almost 40% of their take home pay on rent, so saving 2/3rds is already impossible.
Even as one of the lucky ones earning a top 1% salary, I _still_ pay 40% of my take home pay on a mortgage with a 33 year mortgage term!
Your idea of getting off the treadmill must be living in the countryside and taking a 80% pay cut, I suppose?
Before coming to London I was doing an equally demanding role on 20% of my current pay.
Or how about raising a family in a 1 bedroom flat? - i see loads of people doing that these days. My old neighbours both had full time well paid jobs and were still in a 1 bed with a newborn.
There's no real escape. The economy is a dog, and we are all underpaid.