Well for one, remember you are only 25.
I am 32 and I have shifted my focus in training over the last year or so. I feel pretty amazing actually, joints and all. I still feel like I am in my 20s personally. I use training now as just a means to keep my body athletic, burly, strong and able to perform hard physical work. I will also give myself new challenges to learn or achieve. For example, currently I am working on doing hand stands and using parallette bars.
As a whole, I still squat heavy and frequently. However, I do not bench press or deadlift. Not because I can't, but because I don't care about it. Along with squatting, I do lots of overhead pressing of all sorts using all different kinds of implements, lots of dips, chins, pull-ups, and different types of pulling off the ground. I put a huge emphasis on stretching, mobility, and soft tissue work-- I owe how I feel to all of that. I think as you get older, that really does become more and more important if you want to continue to perform at your best and feel good.
Like IronOne, I am still setting PRs. I also take up new feats here and there, such as closing the Captains of Crush grippers or setting new bench marks in my conditioning. I try to keep fresh things in my training. We have our lifetimes ahead of us man, you should be excited about what you have accomplished thus far and what you will accomplish in the future. I can relate for sure man. The gym is my sanctuary as well. I think you should just get more creative with your strength endeavors, there is a lot of cool stuff you can still learn, train to do, and accomplish.