I began riding a road bike at my young 70s (almost 80 now). At 50 you are still a sweet young thang with a bright future ahead of you. There is quite a bit of adjustment on bike fit. The stem can be had in different length to support the bar further forward or closer to the cyclist. Also, they are available in different angles to support the bar higher or lower by flipping it over. This all means that any bike that is about right can be further adjusted to accommodate a higher or lower position. I would add that as you get up to riding 50 miles, your original position will change to something somewhat longer and lower.