How to add +1value on the entire row of my database table row name Age? : just new in programming i created a database using xampp with 3 column (f_name, l_name, age) i created a index.php page where i have only 1 button present, what i am expecting to happen is that if i click that button the entire row "age" will commit +1 to all current value inside the "age".(possible?)

but unfortunately i don't know how to do the code. i would like to see one 
simple example of code that will do the +1 to the entire row of age.
at lease a base logic that will help me figure it out how to do it.

thanks advance and sorry for my bad english.