Flexible electronics represent a paradigm shift from traditional rigid systems, enabling the development of conformable, lightweight and sustainable devices through innovative materials and engineering approaches. This field evolved from early experiments using wax-coated paper and metal conductors in the early twentieth century to modern nanomaterials and advancements in additive manufacturing. The integration of nanomaterials and composites with electronics and flexible textiles, which began in the early 2000s, has revolutionized the world of materials science and technology. Renowned nanomaterials such as metal nanoparticles, graphene, carbon nanotubes, MXenes, dichalcogenides and conducting polymers, known for their electrical conductivity, strength and flexibility, have facilitated the creation of lightweight and flexible electronic devices. Here, the nanomaterials and composites in the field of flexible electronics and wearable devices are explained. The advancements in the field support applications from wearable health monitors to VR devices, while addressing historical limitations in surface roughness and environmental stability. The challenges and future advancements to expand the electronic performance and mechanical durability to meet the demands of the digital world with virtual reality and the Internet of Things are briefly explained.