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TGR
For men aged 20-39, the healthy range for body fat percentage runs from 8% to 20%, and for men aged 40-59 it’s 11-22%.
http://www.coachmag.co.uk/exercises/lose-weight/3809/what-is-a-healthy-body-fat-percentage
Of course being superlean but not exercising may be less healthy than a small tyre and exercising, so, it's only a factor of health.
You seem to walk/run/do sports a lot I wouldn't worry! :)