Oh yeah. Doctor Who is awesome.
I remember the regeneration from 4 to 5! But then my childhood watching faded when 6 regenerated into 7. I've not seen any of Sylvester McCoy's doctor, I think. I've seen Paul McGann's film only once. It was fantastic to see him again in the little short lead up to last years specials.
My favourite is definitely 10. David Tennant is just superb.
My daughter started watch at about 3 years old. She did watch 10 but doesn't remember it much. 11 is her doctor. She cried after watching Amy's last episode. She loved Amy. She cried even more after Matt Smith's last episode. Almost inconsolable. She is 8 now.