2 sliders for the same fields

[#1]

In a sheet ages are divided into classes. I want to apply on these classes 2 sliders, one that allows you to see what the age curve is on eg 3 years and the other  slider which the age curve will be at about eg 15 year.

What do I need to do to make this happen. The chart is ok when I use 1 slider, but how to provide the second one.

Thanks

[alexandros17]

for the second slider use an expression as field:

=

if(year>=2009 and year<=2012, year, null())

[#3]

Thanks for your answer but perhaps some more info.

The chart with 1 slider, works correct with Demension

=class(age(MakeDate(Year(Now(1)), 12,31),dateofbirth) + if(Expression='Future', vAddToAge, 0), 5, age between', 0)

For the second slider I have copied Expression='Future' to Future2 and vAddToLeeftijd to vAddToAge2

At least I copied  Dimension

=class(age(MakeDate(Year(Now(1)), 12,31),dateofbirth) + if(Expression='Future', vAddToAge, 0), 5, 'age between', 0)

to 

=class(age(MakeDate(Year(Now(1)), 12,31),dateofbirth) + if(Expression='Future2', vAddToAge2, 0), 5, 'age between', 0)

At that moment the line of the first Dimension disappeared en the second dimension become the legend.

What do I Wrong ?