My DM was 81 yesterday - she is generally in good health although she is in her 3rd year of Alzheimer's dementia. She has osteoarthritis in her hip and spine, and she takes blood pressure medication. She's a little overweight, maybe a stone or so.
She can't walk far owing to pain in her hip and spine, but she still goes to church and the shops on her bicycle. I've noticed, however, that the slightest bit of walking - even 100 yards on a level service - makes her extremely breathless, and wheezing severely on the out breath. So much so that yesterday I was quite worried when I took her back up to her flat (she still lives independently), she looked about ready to collapse. But her breathing returned to normal in the time it took to take her coat off.
She has no swelling of her feet or ankles and has never complained about her breathing, I can just hear it. She won't go to the doctor as she keeps saying (lightheartedly) that she's had enough and is ready to die, so she's likely to dig her heels in about seeing a GP.
Nothing, or the onset of something like heart failure?