I had my forth child 15 years after my other three, when I was well into my mid-30's. I find that appreciate/savour/lament his growing much more than I did my

I had my forth child 15 years after my other three, when I was well into my mid-30's. I find that appreciate/savour/lament his growing much more than I did my others. Maybe this is because I am an older dad or maybe because I have grown 3 children already and I can appreciate how quickly those years pass.