person A: My youngest child started high school this year. It really made me think back to her starting kindergarten_comma_ and how time really goes by. I can just see her learning to read!
person B: It is so hard and so rewarding to see them grow up. 
person A: Yes_comma_ it really is bittersweet. But_comma_ the older they get_comma_ the easier it is to think back to the younger days!
person B: I bet.  I really want to hold on to mine forever_comma_ but I know that they need to grow up.  I hope you are still able to make memories with yours even as they are getting older.