There is more joy on ER over a sinner who repents
I don't remember exactly when, but it was something north of 30 years. I got off to a slow start, didn't max it out until late in the game, and generally made every possible investment blunder at least once. If you're seeking the poster boy for How To Do It Wrong, you need look no further.
DW and I married young, started having kids quickly, and had a bunch (5) of them. Children are Lamborghinis: they can outrun you easily, they test your skills every second and they're very expensive, although if you can afford them it's worth it.
Consequently, some years I couldn't spare the cash to contribute enough for the full company match. Oh, well. Family needs superseded my retirement dreams, and I don't second-guess that decision.
I toggled between investment extremes - and always at the wrong times -either the low-risk Stable Value option or the high-risk Small Caps and International Fund options. I took out loans to replace heat pumps and roofs. At one time, there was even an option to direct my savings into company stock and take delivery of the shares, which I then sold to fund car repairs.
Some might think it embarrassing to confess such a large basket of ER errors, but not me. Au contraire; I'm a good example that it's time and persistence, not timing or cleverness, that builds financial security.
Eventually, after about 20 years, I did get serious about retirement prep and did two things correctly:
1) With every salary increase I boosted the automatic deductions from my paycheck so it went right into the account without it ever crossing my hands, and
2) stuck with an allocation so it could compound undisturbed. It usually compounded slowly, but it compounded nonetheless.
Of course, had I maxed it out from day 1, resisted the harebrained DMT attempts, and never tapped it, it would be 2-3X larger today. But it's enough, and as Mary Poppins reminds us "Enough is as good as a feast".
Now, when fresh faces appear on this forum, distraught over thinking they've been idle too long and RE will be unattainable, I can honestly reassure them that it's never too late to get on the right track. Just look at me.