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Our plan is to be able to retire at 50 and no later than 55 (still pretty late but it is better than 65!). We have strict ira/investment/savings plans that we pay into before we do anything else. We made a lot of financial decisions like how big of a house to buy, cars, etc. based on how much we wanted to be able to save for retirement.
In the office I work at, we just had a woman 'retire' at 39! Her husband is a little older and worked longer than her, but they had the same idea and had been saving hard since their 20s. They don't have kids either and they plan to just travel from now on, living in places for a few months at a time. I wish I was there already!!