My mum knows someone who has a 10 year old that still co-sleeps so I also didn't end up going down that track.... total end to intimacy in that marriage I reckon.
Only if you only DTD in bed which frankly would get pretty boring....
I think a 10 year old in the bed would be a one in a thousand. I know a 25 year old who still sleeps in her parents bed but she is a survivor of torture so I wouldn't judge co-sleeping by her case.