The defender helped Villa U18s win the FA Youth Cup, Premier League South and Premier League National Final.
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Villa academy chief Mark Harrison said: "Ashton has been at the academy since his Under-9 year, so we are delighted to see him sign his first professional contract.
"He was a member of the Under-18 squad that won the treble last year.
"Ashton is a competitive, attack-minded full back who likes to get up and down the pitch, and he captained the Under-18 side at times during their successful season. We look forward to watching Ashton develop."