I'm late 60s and had my three at 35, 38, and 40 (so they are 34, 32 and 29 at present). Incidentally, back to the time I was first pregnant, I found that in our NCT class I was the middle of five age-wise, so by no means the eldest then even at 35.
I feel I had the benefit of an established career and the confidence that being a slightly older mum brought. Fortunately, we are all fit and well now, but who knows when any of my offspring will actually decide to have babies! I would like to be a grandmother at some stage, though at the moment I'm enjoying the freedom that I have, particularly to travel overseas to visit my two daughters.
I do believe it isn't all down to luck as there are many ways to increase the chance of good health in later life. I go to the gym six days per week, cook from scratch, and grow my own veg. I also cut drinking on a regular basis (so no glass of wine every evening) and improved my sleep patterns. It all takes a bit of effort but the results are so worth it. There are lots of excellent books and podcasts on longevity and improving life chances that are worth reading/listening to.
My ex-husband (the children's father), now 70, hasn't aged quite so well, though there are factors that have influenced this. He smoked until five years ago, is overweight, resulting in pre-diabetes and high blood pressure, and is definitely slowing down physically. He still has a penchant for baked goods and snacking though.
Given the choice, I'd probably do it all this way again, though it would have been nice to have a few more years between the children growing up and my retirement. I still have one at home too!