I'm not in my 60s yet, but I've struggled keeping a routine all of my life and I've discovered that I feel like my days are slipping away when I do well at it for a stretch.
Please elaborate on this idea of time moving so fast in your 60s. It is terrifying to me. I'm in my early 40s and I already feel like it is slipping away from me so quickly. I want to achieve my ambitions and I also want to enjoy life, and despite being at the peak of my competency, it just feels like there's never enough time for both.
If I "blinked" when I was 40 (in the sense of not paying much attention to what was happening over what felt like a not particularly long period of time), maybe a week would go by.
Now, it's months. Or maybe it's an effect closer to memory "time compression". When I was 40, 6 months of memories was quite a distinct cluster of different things. Now, 6 months of memories is closer to one memory. It's not precisely like that, and certainly not all the time, but that's a handwaving general description of how I perceive things these days.
Yeah, this is absolutely horrifying. I have seen this phenomenon discussed before, and I can perceive its impact in my own life. It implies that from the standpoint of perception my life may already be mostly over without me having realized it.
In my 60s, yeah, energy down significantly, and time moves so fast.