Five Parameter

we seek to predict candidate longevity after being elected, using covariates like age, sex, or etc. One specific problem is the stability over time, because life span has increased since the past.We are using a Bayesian regression model with the formula lived_after ~ sex * election_age and the independent variable is sex while the dependent variable is the varaible lived_after

$$ lived\_after_i =  \beta_0 + \beta_1 male_i + \beta_2 c\_election\_age_i +  \\ \beta_3 male_i *  c\_election\_age_i + \epsilon_i $$