How to explain detail the output result base on the dependent variable is Total salary & wages received in reference month related to wage differential and factor age, year

Total salary & wages = 458.39 Age + 790.21 Mixed Model Analysis Warnings The final Hessian matrix is not positive definite although all convergence criteria are satisfied. The MIXED procedure continues despite this warning. Validity of subsequent results cannot be ascertained. Model Dimension 1 1 1 4 Number of Covariance Number of Subject Levels Structure Parameters Variables Fixed Effects Intercept Age Random Effects Intercept + Age 2 Variance 2 Industry Components Residual Total a. Dependent Variable: Total salary & wages received in reference month. b. As of version 11.5, the syntax rules for the RANDOM subcommand have changed. Your command syntax may yield results that differ from those produced by prior versions. If you are using version 11 syntax, please consult the current syntax reference guide for more information. Information Criteriaa -2 Log Likelihood 1293909.174 Akaike's Information 1293919.174 Criterion (AIC) Hucvich and Tsai's Criterion 1293919.174 (AICC) Bozdogan's Criterion 1293969.909 (CAIC) Schwarz's Bayesian 1293964.909 Criterion (BIC) The information criteria are displayed in smaller-is-better form. a. Dependent Variable: Total salary & wages received in reference month. Mixed Model Analysis Warnings The final Hessian matrix is not positive definite although all convergence criteria are satisfied. The MIXED procedure continues despite this warning. Validity of subsequent results cannot be ascertained. Model Dimension 1 1 1 4 Number of Covariance Number of Subject Levels Structure Parameters Variables Fixed Effects Intercept Age Random Effects Intercept + Age 2 Variance 2 Industry Components Residual Total a. Dependent Variable: Total salary & wages received in reference month. b. As of version 11.5, the syntax rules for the RANDOM subcommand have changed. Your command syntax may yield results that differ from those produced by prior versions. If you are using version 11 syntax, please consult the current syntax reference guide for more information. Information Criteriaa -2 Log Likelihood 1293909.174 Akaike's Information 1293919.174 Criterion (AIC) Hucvich and Tsai's Criterion 1293919.174 (AICC) Bozdogan's Criterion 1293969.909 (CAIC) Schwarz's Bayesian 1293964.909 Criterion (BIC) The information criteria are displayed in smaller-is-better form. a. Dependent Variable: Total salary & wages received in reference month