cannot create required if custom validator

[ahmedthinkdifferent]

i need to check that value is exists if field exists and in another scenario wants to validate that value is exists if field exists with this custom value.
{
"gender":"male",
"age"20
}
want to check that age exists if gender exists.
second scenario.
{
"gender":"male",
"age"20
}
wants to check that age exists if gender is male because females don't like others ask for their ages.
Thanks

[srcnix]

Use 'check' or 'custom' property on the validator itself?