Is being a late teether correlated to having stronger, healthier teeth as adults?

I don't believe : There is any scientific correlation to support that theory. Often it's genetic, medical or developmental issues that play a bigger role. Obviously maintenance of good oral hygiene is paramount to keeping the gums and teeth strong and healthy.

Maybe: The older the child is when their teeth erupt, the more dexterity they will have when brushing. Hopefully, they will do a better job of brushing and keeping plaque off the teeth. However, strong teeth also depend upon a healthy diet and avoidance of sugary foods.

Not Necessarily: There most likely is no correlation between getting teeth later and them being stronger.

Not directly: However if they get their teeth late a child may be better at brushing them when they finally come in. Also because the parent is concerned about the 'late teething' they may actually pay more attention to the child's overall oral health, which will lead to healthier teeth.

No correlation: Tooth health related to integrity of tooth structure, oral hygiene, diet, avoidance of smoking (anything) and alcohol abuse, and regular dental care, not to chronological age of patient when teeth erupt.