You'll see this appear in many places...... there are only three contact points with the bike: hands, rear end, and feet.

Given that reality, fit is often a matter of getting the right balance. While your bike might be a good fit, it may not be dialed in to your particular needs. Generally, numb hands mean there is too much pressure on them. I would suggest making very small adjustments to the angle of your seat before raising the bars. A very slight (sometimes as little as 2 to 3 mm) shift of the seat's nose up can shift your hips enough to take weight off your hands. If it doesn't work you can always move it back. I just made such an adjustment yesterday after having disassembled the entire bike for cleaning. After reassembly and on the first ride, I was abut 12 miles into it when I realized my hands were getting numb. I stopped and adjusted the nose up just a hair and everything was fine. As a second thought, are you wearing cycling gloves?

Oh, and welcome the to 50+ forum.