I sometimes shop at an Amish store just north of Statesville in the small community of Windsor Crossroads. I've seen several of the young Amish (late teens-mid 20s) on bikes, simple, rigid steel-framed MTBs. I saw one Amish woman pulling a bike trailer, loaded with groceries, with hers.
The store is on a popular road for rec cycling, and I often see spandexed roadies taking a break there. So far no Amish/roadie showdowns, though....