You need to do whatever works for you. Don't overlook things like the details of your posture on the bike though.
For me the upright position isn't necessary, but I find it very important that I have a relaxed upper body. That means no hunched shoulders, no tight grip on the bars and so on. I have fingers loosely draped over the bars, elbows bent, shoulders relaxed and so on. Makes a huge difference.
You may find that happens more automatically with your upright posture. Then again you may find you don't need to go more upright if you take care to maintain a loose relaxed upper body.
I am 11 years your junior, but I haven't had to make any adjustments to my riding position. I have always needed to stay relaxed and maintan a relaxed posture.
Just something to consider.