1. Introduction

2. Data: the VUDS survey and associated photometry

3. Combining spectra and photometry to measure ages and other physical parameters of galaxies: the GOSSIP+ tool

4. The ages of galaxies: definitions

5. Measuring ages and degeneracies at z>2: Simulations

6. The age distribution of galaxies with 2≤z≤6.5 in VUDS

7. The formation redshift function (FzF)

8. Discussion and Conclusions: The epoch of formation of bright massive star-forming galaxies