Get a road bike,some folks set them up at first in a more upright position{lower seat,higher bars** almost like a hybrid.Then as you get use to riding and your back stretches out,you can go to a more traditional road bike set up.Some bike fitters don't have a clue how to set up a bike for some one over 50.For me now,the most comfortable position for my back is in the drops,which seems counter intuitive,but your back will stretch over time.Have fun and good luck