Excessive level of testosterone in older man.

[pattcook]

I,m a 75 year old with a history of high testosterone . 12 years ago I was at 920. a year ago it was 1020. today it was 1094. My hormonal testing comes back normal and I,m quite healthy. My doctor seems baffled. In the past I was told that a small % of men had high levels. I,m worried as I know though high T may sometimes happen it isn't normal for it to be increasing at my age. Any advice and what can I ask my doctor? There is a multitude of info about low T but virtually nothing about high T. No I have never supplemented with Testosterone or anything else besides vit D and magnesium.thanks