My FEV1 ranges between 52-60% before bronchodilator and 62-68% after bronchodilator. I have never smoked and am a healthy weight. I am really concerned about the natural loss of FEV1 with age, given that I am still relatively young. My FEV1 in absolute terms sits at around 2.65L (I am on Symbicort 2 puffs twice a day), and my mathematics tells me that if I lose 20-30mL each year with age (which I believe is accurate) then I am going to be in trouble in the years ahead, even if I do feel relatively OK currently. Would be incredibly grateful for any information or if anyone could help to put my mind at ease. My specialist seems a little perplexed because I never had any symptoms other than a really mild night-time cough/wheeze at times, and then when I had my first ever lung function test in October of last year, I was diagnosed as moderately-severe obstructive disease. I have been trying to exercise a lot to help things and have started swimming recently (swum 50km over the last 2.5 months). When I had lung function yesterday though, my FEV1 was still stable which was deflating, as I had been hoping for an improvement. Does anyone have any advice on what else I can do to improve my FEV1 so that I have more space-to-move when my FEV1 naturally reduces with age? I am worried that my situation is not dissimilar to COPD, though I have never smoked and my FEV1 is at least partially reversible. I am not sure if this is the case? Thanks so much for your help.