Access help, changing updates over a certain number?

I have this code for changing my birth date to soccer categories. UPDATE T_Formulaire SET T_Formulaire.Niveau_Suggestion = "U" & Year(Date())-Year([T_Formulaire].[Date_de_Naissance]); I want to make it so everything that gives over U17 (U18,U19,U20) writes senior. I'm not pretty good with access... show more I have this code for changing my birth date to soccer categories.
UPDATE T_Formulaire SET T_Formulaire.Niveau_Suggestion = "U" & Year(Date())-Year([T_Formulaire].[Date_d...

I want to make it so everything that gives over U17 (U18,U19,U20) writes senior.
I'm not pretty good with access and I would need a little bit of help with that!
Update: [Date_de_Naissance]); (Missing part)
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