How to get the combination table in Google Ads through api?

I want to fetch ad group performance report with two demographics, gender and age_range, also with other metrics. So I used gender_view with query body below, but found the information of age_range are all "UNSPECIFIED". By the way, age_range_view is the same result which the information of gender are all "UNSPECIFIED".

SELECT
    segments.date,
    campaign.name,
    ad_group.name,
    ad_group_criterion.criterion_id,
    ad_group_criterion.age_range.type,
    ad_group_criterion.gender.type,
    metrics.impressions,
    metrics.clicks,
    metrics.cost_micros, 
    metrics.conversions

FROM age_range_view WHERE segments.date BETWEEN "2021-01-01" AND "2021-04-30"

Is there any good method to query?