If nested formula - all same result

[toony]

Hi. I am grouping ages using the below formula but all gives "Adult" if you can help me please. I've tried to change the > and < symbols but to me the below makes sense and don't really know what i'm doing wrong if you can help please.
=IF([@Age]>=18,"Adult",IF([@Age]>=40,"Mature","Senior"))

 

[DanteAmor]

Glad we could help & thanks for the feedback.