Let's assume yo data are in a data frame named df. You can get the average Age of Gender == "M" and Job == "E" with
library(dplyr)
df %>% filter(Gender == "M", Job == "E") %>% summarize(Avg = mean(Age))
You can get the average of all combinations of Gender and Job with
library(dplyr)
df %>% group_by(Gender, Job) %>% summarize(Avg = mean(Age))