The best FIFA 19 wonderkids can be found here. These are the best fifty right midfielders based on potential rating.
The list comes with current overall rating, potential overall rating and growth. Furthermore the wage and value are very useful for your career mode.
The wonderkids for FIFA 19 are not older than 22 years. They are among the fifty best players sorted on potential rating. This is the rating which a wonderkid will reach during his career.