Katek, those shoes sound gorgeous. I wouldn't even hesitate. I'm 75 in September and most of my shoes are ballet pumps. Tbh I never even thought of them as being inappropriate. They seem to suit me though probably not good for my dodgy knees. I'm not a typical 70+ year old, and a bit mad, so that probably helps. I keep thinking about pink cerise, and now I want a pair ! I often wear with leggings and a long-enough top.
Hope you've actually got them by now. There is a high street shop, presume I can't mention it, but its name implies a comparative degree of heat. I took one look in there and beat a hasty retreat. I'd need to be old to be seen alive in that stuff ! Enjoy the lovely pink cerise pumps.