The smaller fruited, indeterminate varieties tend to be older.

A few of the "heirloom" tomatoe varietes are KNOWN to be quite young (several VERY young) but are open pollinated and share traites with older varieteis.

At least one of the heirlooms being sold is claimed be a selection of a tomato that grows wild in Mexico.

Determinant varietes tend to be younger (but not always) and so do the larger fruited varieties (again, not always)

Based on writings of early European explorers, the garden tomatoes of indigenes were already quite distinct from "wild" tomatoes.