When are they old enough

After a hard day of work and going to bed at 2:00am I was needing a good nights sleep. Somewhere between 3:00am and 4:00am my wife grabbed my sleeping pillow mumbling something about your daughter needs it. I asked WTF and she said the daughter is not feeling well. Thinking it was my 8yr old in bed I didn't protest too much with the fact I had to give up my special sleeping pillow. After a restless, tossing and turning night I wake up not to see my 8yr old but my 17yr old in bed with me. Ya hear people say kids grow up so fast and the next thing you know they are grown up and have left home. I am just waiting for the time they are grown up and out of my damn bed.
Sigh