Nested IF AND formula help

[hayleighs3]

I am trying to create a formula to compute the following:

IF stop_living = 19 AND age> 19 THEN "18"
IF stop_living = 19 AND age <18 THEN age

Thanks in advance!

[Crooza]

Hi and welcome

Maybe

=if(and(stop_living = 19,age >19),18,age)