Tinsley (1977) characterized the dawn of the era of quantitative age-dating: "The colors and spectra of galaxies are therefore sensitive to the presence of OB stars, red giants of the old-disk type, and/or metal-poor giants of the halo type. From their relative numbers comes information on the age and metallicity distribution of stars in different regions of galaxies, which is turn gives clues about galactic evolution. Despite decades of observational and theoretical work in this field, many interesting details are still out of reach..... A challenge for the future is to exploit further what can be seen in the integrated light, of systems whose HRDs cannot be drawn point by point, to obtain a fuller understanding of the evolution of stars and stellar systems." The field pioneered by her has gone a long way since these early days.
Acknowledgments
I wish to thank the organizers for providing travel support and for making this meeting so successful.