history: I was looking at old photographs of my son yesterday, and almost started crying. I still remember those days, and started looking at all of his old baby clothes
current: I always hate thinking that my son is getting old. Just like a few days ago, I was looking at some of my sons old clothes, and it made me very sentimental. I never want him to get old on me. 
next: I believe you are really sad although it's a fact of life