age -->
  <!--
    Configure experiments inside the `amp-experiment` inside a JSON object. Use `variants` within each experiment to declare how many users in percent will be part of an experiment variant. The total sum of the variants must be a number <= 100. If the sum is < 100, then the default behaviour is used. A user belongs to one of the variants based on a random number generated between 0 and 100.

   For more details about variants read the official [documentation](https://www.ampproject.org/docs/r