So I started contributing to my employer 401k (federal TSP) as soon as I was eligible, and up to the match (5%). I was 32 at the time, having started my career late as a result of 6 years of military service, followed by 7 years of schooling (undergrad & law school). But I was still horrible with money. I had credit card debt that eventually got to around $12K, and about $80K in student loans (which could easily have been far less had I been Mustachian then), which I deferred my first year out of law school because I wasn't making diddly (in truth, had I been Mustachian then, I could have made those payments). About 2 years out of law school, I got serious about eradicating the credit card debt, taking out a fixed personal loan @10% to do it. Got it paid off in 3 years. But I continued to make TSP contributions and to increase my contributions with each pay raise/promotion. Made some more financially stupid decisions when it came time to make an honest woman out of my longtime girlfriend, in the form of borrowing to pay for the ring (a stupidly expensive ring, but I felt guilty for having waited 16 years to pop the question) and spending an insane amount of money on our wedding ($15K of our own money, which we saved, $25K from her parents -- UGH). Yet despite all that stupidity, I continued to save in my TSP, until around 7 years into my career, I began maxing it out and have ever since. Over the past decade, I got way better about managing money, and over the past couple years since finding MMM, I improved dramatically more. My FIRE date is set (Jan 2020), and it's always been a function of my job, which will allow me to retire with a pension at that time, and likely with a fat TSP balance, at age 54 (well, 53, if I really wanted to).
I'm extremely happy with how everything's turned out despite my missteps, but can't help looking back sometimes and thinking about how much better off I'd be financially had made more sound financial decisions earlier in life. Hell, even in my 20's when I was in the military and school, I could have been making IRA contributions each year had I chosen to. But that's all water under the bridge now. But hopefully those of us around here who are a little longer in the tooth can serve as an example to the young Mustachians on this website.