Johnnie Walker Blue Label is, like most Johnnie Walker whiskeys, a blended scotch bottled to the specifications of Scottish Law. The laws state that if an age is to be listed, it must be the age of the youngest scotch. For that reason, many blends leave off the age, as the inclusion of a very young scotch would make the age seem unimpressive (for instance, blending a 20 year old scotch with a 6 year old scotch would make the blend a "6 year old blend"). Johnnie Walker does not release aging for its Blue Label blend (it does for other labels), but it is oft reported that the blend contains some very old scotches, some aged 40 years to upwards of 60 years.