No, as the WISC is only normed based on age, it should not be administered to those outside of its age range (6:0 to 16:11). Wechsler has another measure, the WPPSI, for the under-6 set. Testing a child at 5:9ish on a WISC would result in invalid scores.
Although the Dutch version of the WISC has separate norms, I wouldn't think that the age range would be any different as the WPPSI is also available in Dutch with separate norms.