meta_query all posts between to ages

you can write like for this.

'meta_query' => array(                  
   array(
      'key'     => '_age_from',
    'value'   => sanitize_text_field( $_REQUEST['age_from'] ),
    'compare' => '>=',
    'type'    => 'NUMERIC'
    ),
   array(
    'key'     => '_age_to',
    'value'   => sanitize_text_field( $_REQUEST['age_to'] ),
    'compare' => '<=',
    'type'    => 'NUMERIC'
   )
);

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