I bought my house a few years ago. I have been trimming my bushes at the height the previous owner had them. I think they are juniper bushes. They are about 5 feet tall. They are getting bare. The bottom 2 feet have no growth. The next couple of feet has sparse growth. Only the top and outer side have any growth. Ideally I would like these to only be about 2-3 feet high so they don't hide the front porch. Can I cut them down a foot or so over the next couple of years without harming them? Or is it time to replace them. A neighbor told me he thinks they were planted about 23 years ago.