Noninvasive diagnostic techniques have become integral to modern dermatologic practice. This chapter reviews tools such as skin scrapes, Wood’s lamp, dermoscopy, confocal microscopy, tape stripping, optical coherence tomography, and multispectral imaging. These methods support early detection of malignancies like basal cell carcinoma, squamous cell carcinoma, and melanoma and aid in evaluating benign, inflammatory, and infectious skin conditions. In older adults, the tests help reduce procedural risks, discomfort, and wound complications while enhancing diagnostic accuracy in subtle presentations. Practical considerations, including cost, training, and accessibility, are also discussed. Despite limitations, these technologies represent a major shift toward more individualized and risk-sensitive care, especially in the aging skin. They improve real-time decision-making and patient outcomes and are valuable tools in general and geriatric dermatologic practice.