From what you've shared, it may be best to move on. If there is lack of passion and trust present, then why hold onto him? That won't be fair to him nor to you and neither will be fully satisfied or happy.
Age has nothing to do with passion. It is an emotional state of mind. Sexual intimacy issues are another thing and may be caused by different factors from depression to hormonal changes.
You've got to ask yourself what would be accomplished if you talk to him about the things you've shared in your post. What would you want to get out of it? That won't necessarily change how you feel towards him. Perhaps the flame of the relationship had burned out long ago.
I do not want to regret anything I choose to do.. I do not want to hurt him anymore than I have in the past. How exactly do I tell him the flame has burned out? Why doesnt he feel the same? We have sex every so often, I feel like we shoudl more.. but than I feel like I dont even want to..
what response would you like to get? You've asked if you should "What do I do? Leave him? Talk to him about things? Move on?