Transducers, tools, devices, apparatus, systems and methods for rejuvenation and aging treatments. The invention can convert an input alternating current into a positive higher frequency output to energize a crystal pack or a plurality of crystals. The rejuvenation transducer includes an input power source to supply a lower frequency input current, a pulse generator to produce a positive higher frequency electrical output pulse from the lower frequency input current, a crystal pack coupled to receive the positive higher frequency electrical output pulse from the pulse generator and produce a gigahertz output and the crystal pack modulates the signal, and a light emitting diode in the current path to indicate an energized state of the rejuvenation transducer. Treatments with the transducers show telomere lengths being lengthened causing a rejuvenation effect.