How to change the Thickness of OUTLINE / BORDER frame ?

Hi,
I want change the Thickness of a Frame border. I my phone the border is VERY small..

My code :

<Grid RowSpacing="0" ColumnSpacing="0">
      <Grid.RowDefinitions>
        <RowDefinition Height="50" />
      </Grid.RowDefinitions>

      <Frame OutlineColor="Red" Grid.Row="0" Grid.Column="0" Margin="20,0,2,0" Padding="0" HeightRequest="36">
        <Label Text="Femme" XAlign="Center" TextColor="#FFFFFF" FontSize="14"/>
      </Frame>

      <Frame OutlineColor="Red" Grid.Row="0" Grid.Column="1" Margin="2,0,20,0" Padding="0">
        <Label Text="21 ANS" XAlign="Center" TextColor="#FFFFFF" FontSize="14"/>
      </Frame>

    </Grid>

Thx