I have a hydrangea that is approximately 8 years old. In the fall of 2013 it was pruned back quite a bit. Before pruning, it bloomed very well every year. For the last 2 years, it has not bloomed at all or maybe just a few blooms. There are a lot of leaves that have a good green color.
Hydrangea Stopped Blooming
Certified GKH Gardening Expert
Here is an excellent article that will help you.
Determine the type of Hydrangea you have planted.
Also remember weather stresses can and will play a part in the plants performance. We did suffer and very cold winter across much of the United States.