Harmonized Costa Rican Longevity and Healthy Aging Study (Harmonized CRELES) is an easy-to-use version of data from the first five waves of the Costa Rican Longevity and Healthy Aging Study (CRELES) with a set of harmonized variables suitable for cross-country analysis. Using the RAND HRS and Harmonized HRS as models, Harmonized CRELES defines variables as identically as possible with the RAND HRS and Harmonized HRS to allow users to compare variables with all other Harmonized data sets. Documentation for each variable in Harmonized CRELES, including a description of its creation, the CRELES variables used, and descriptive statistics, is detailed in the Harmonized CRELES codebook.