My DS1 was 17 months when he cut his first tooth. No joke! He was gummy for the first 17 months of life! Google told me that it's pretty much impossible for late teething to be a probem - it's not like there are no teeth there or something.

My DS2 just turned 1 and has one tooth. He also doesn't crawl, but is smart as a tack and has awesome fine motor skills. They all do things in their own unique way.