I hadn't stopped to think about this before, but we must have hit 100k in cash and investments sometime in the last 2 years. I only discovered MMM last year, so have slowly begun developing habits to determine how to up our savings rate (e.g. monthly tracking) and have been reading up on investing so that we can start taking charge of our investments and get rid of our bank financial adviser and his funds (2.7% MER, anyone??). Before that, I had steadily been putting away 12% gross (my employer's RRSP match is in there), DH has been putting away 5% gross but has a defined-benefit pension (we do need to work on his savings rate), and now we're maxing out the kids' RESPs every year. If we assume it was 1 year ago, then it took about 10 years out of university (DH and I both had student loans to pay off for engineering school), a few not-so-mustachian purchases (economical but brand new cars), the purchase and sale of our first house, and purchase of our "forever" home (1850 sf, but big corner lot). The mortgage on the house puts us into the negatives for net worth (owing about 310k), but we're very comfortable with the payments and our interest rate.
Looking back, it wasn't hard on us to get this far because we automated everything, and we bring in decent money. However...looking at things from a MMM perspective now, I'm kicking myself that we didn't save more aggressively pre-children. I think we blew a bit of a golden opportunity there - it cost us over $12k for day care last year, and obviously we have the money for it. So why weren't we investing that money pre-children? Live and learn, right? I am 34, so I've still got time to catch up as I learn, I think :) The good news is, day care fees will drop once my son starts grade 1 in 2018, and drop again once my daughter starts in 2020... so all of that money is going straight to investments.