Photec wrote:
I am in your condition at 74, with my D4 and D850. I bought the Z7 w/24-70 f4 and it is my new walk-around camera that has fixed all my hand holding problems. You might prefer the Z6, which might be a closer match to the D750. IBIS and VR are outstanding! I don't know exactly what all the II models are going to bring to the table, but the 6&7 will definitely drop in price by New Year.
I've read five pages of comments and just about all are giving you something to think about (except the total gym post, LOL). If you are using the camera mainly for street photography I would suggest as Mark did a Sony RX10 ... light and gives you a full range. Another suggestion is the Fuji X100F (now out is the V) which you can pick up on Craig's List. I bought my X100F used on Craig's list a year ago for $500 and love it as a point and shoot. It also has the bells and whistles if you so desire to have total control over what the camera does.