I had loss of smell over time but I dismissed it as sinus issues. Also had overactive bladder issues that I just dismissed as getting older. I had two bad knees so walking was painful but I started feeling like I was walking stiffly as if walking on stilts but I passed it off as just my knees. Once I was diagnosed and put on meds, I wasn’t walking stiffly any longer. Also be aware if you are starting to deal with depression and or anxiety or apathy.
My suggestion is to stay active with High Intensity Interval Training, take a good probiotic and keep your cholesterol and sugar levels healthy so if you are prone to get it you can hopefully slow progress.