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We performed the photometric analysis of M2 and M92 globular clusters in gand r bands of SLOAN photometric system. We transformed these g and r bandsinto BV bands of Johnson-Cousins photometric system and built the colormagnitude diagram (CMD). We estimated the age, and metallicity of both theclusters, by fitting Padova isochrones of different age and metallicities ontothe CMD. We studied Einstein and de Sitter model, bench mark model, thecosmological parameters by WMAP and Planck surveys. Finally, we comparedestimated age of globular clusters to the ages from the cosmological models andcosmological parameters values of WMAP and Planck surveys.

Age Estimates of Universe: from Globular Clusters to Cosmological Models and Probes