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Aims. We present a new technique to estimate the relative ages of multiplestellar populations hosted by five globular clusters: NGC 104 (47 Tuc), NGC6121 (M4), NGC 6352, NGC 6362 and NGC 6723. Methods. We used the catalogs ofthe database "HST UV Globular cluster Survey (HUGS)" to create color-magnitudeand two-color diagrams of the Globular Clusters. We identified the multiplepopulations within each globular cluster, and we divided them into two mainstellar populations: POPa or first generation (1G) and POPb, composed of allthe successive generations of stars. The new technique allows us to obtain anaccurate estimate of the relative ages between POPa and POPb. Results. Themultiple populations of NGC 104 and NGC 6121 are coeval within 220 Myr and 214Myr, while those of NGC 6352, NGC 6362 and NGC 6723 are coeval within 336 Myr,474 Myr and 634 Myr, respectively. These results were obtained combining allthe sources of uncertainties.

The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXII. Relative ages of multiple populations in five Globular Clusters