A question for stepkids-do you think it's easier to adjust to a stepparent when you're younger? I would think it would be more difficult for a teen, but I don't know if that's true, since I've not been a stepkid myself.
My son got his Stepfather, my Husband, when he was 6 and I married his Stepfahter, my Husband, when he was 8. He adjusted very well.
My stepdaughter had me in her life since she was 13 months old, and I married her Dad when she'd just turned four. She adjusted very well, considering her Mother spent alot of her energy trying to turn her against me, my Hubby and my son.
I think your question should be "Do you think it's easier to adjust to a stepparent when you're younger?" and "How much is the other Bioparent involved?", because that may play a big part, if not the biggest part, of the child's adjustment.
(Sorry. One too many Apple Martini's tonight and I'm feeling philisophical and speaking from personal experience.)