For me -- 15 years older than you -- it is not so much the slowdown that is the issue (though recently there has been too much of that) but that every run is now a struggle, both in terms of breathing and home uncomfortable my legs are. I suspect there is some kind of undiagnosed issue but I have had plenty of medical tests without anything turning up as being unusual for my age. I presume I was a relatively good runner because my lung function (and cardiovascular system generally) was above average. If my lung function is now age-appropriate then it means it has been declining faster than that of many other people.
To sum it all up... it sucks getting up there on the senior regiment?
For me -- 15 years older than you -- it is not so much the slowdown that is the issue (though recently there has been too much of that) but that every run is now a struggle, both in terms of breathing and home uncomfortable my legs are. I suspect there is some kind of undiagnosed issue but I have had plenty of medical tests without anything turning up as being unusual for my age. I presume I was a relatively good runner because my lung function (and cardiovascular system generally) was above average. If my lung function is now age-appropriate then it means it has been declining faster than that of many other people.