My mom sent me this song via YouTube. It's by Trace Adkins and it's titled You're Gonna Miss This. I'm not really big on country music (assuming this is a country music artist) but this song speaks the truth.
I've actually had a few conversations with D who often say's, "I wish I was an adult so I can...." the list is endless but the funniest one is, "I wish I was old so I can make my own money & spend it all at ToysRUs." LOL! I always tell him, "Enjoy this time because you can't go back." I know this now but I wish I knew/believed it then.
Listen to it. You'll be glad you did.