Simplify the following text for a Grade 4 native English-speaking person.
Original: The pitcher 's mound was not moved back to its present position of 60 f until Young 's fourth season ; he did not wear a glove until his sixth season .
Simplified: The pitcher 's mound was not moved back to its present position of 60 feet , six inches until Young 's fourth season . He did not wear a glove until his sixth .