Calculating Pooled SEM


I'd like to calculate the pooled standard error of mean for a trial in a factorial arrangement but I don't know how to do that.
How should I calculate the Pooled SEM for the main effects and for the interaction effects?

For example:

A factorial arrangement between Country X Age

Country Age Response
A 30 105
A 30 89
A 30 106
B 60 90
B 60 107
B 60 108

What is the pooled SEM for the Main effects (Country and Age) and the interaction effects?
Is it possible to calculate that by Minitab or JASP? I've been trying to find a way to do that but unfortunately unsuccessfully.

Thank you!