This is very true, which is why consistency is so key. I think the reason so many people perceive their health falling off in their 40s is that this is when the cumulative weight of increasing life responsibilities (kids, career advancement, caring for elder relatives, etc.) really hits hard, making it more and more difficult to find time/energy for regular exercise.

True. But you can also be smart about it, and it doesn't have to be something that takes your whole afternoon. 15 minutes of home exercise instead of media scrolling, and at the end of the week, it is 1:45, at the end of the month 7:45 that you've done something. Or just a simple door frame exercise bar where you do a pushup or two now and then. These small things add up. Or to go with friends to play football or my friend started to run, they made a Sunday morning running group. To end with what you've begun, regularity is the key.