Age estimate fits in my opinion. As for the frock, it strikes me as a well-tailored garment (really like the arc to the breast watch pocket) with a military flair. Absent stand up collars and double breasted buttons, civilian and military versions are not always easy to distinguish, but here we have an abundant supply of brass buttons. Interesting cuffs; they look to be functional and strike me as having an unusually high opening which would allow the sleeves to be rolled up pretty high -- fits, perhaps with a surgeon's needs on a cold but bloody day? Can anyone make out the device above his watch chain and fob?

Dave