I'm fine with it, I'm cool with breastfeeding.
Do you think there should be any logical age where the child is too old, or is that strictly up to the mom?
Me personally? I think that it should be up to the mother to decide when to quit, or the child if they decide to wean themselves. It's really not any of my business.
I was breast fed up until I was a year old I think. If a woman wants to carry that up until the child is eligible to go to school? She should decide for herself.
As far as does this cover go too far? Nope, because there are no nipples exposed, and it's trying to make a point that some women will breast feed their children for a long time.
Besides...........did it bother anyone to see that woman in Game of Thrones who was still breastfeeding an 8 year old? Yeah, I know it's a television series, but the point is that women all around the world have differing views on when to stop.
Will the kid have issues? Difficult to say, because it depends on the kid. According to many professional shrinks (who I've had to see on occasion, once to get accepted into a foster care program, and a couple of times in the Navy for security clearances), after hearing about how I grew up, they're amazed that I'm so well adjusted.