Mock Orange bushes

We have beautiful tall Mock Orange bushes that have been growing beautifully and flowering well for 20 years. Every year in the spring there is a lot of dead branches. I always trim them back. Is this the correct procedure…

Identify this shrub

My property is half an hour north of Cobourg. The flowers are very fragrant. It blooms late Spring through mid to late Summer. It is very old. Was there before I bought the place 30 years ago…