Because you want to follow Christ’s example (Mark 1:9), and Jesus told all believers to do it and set an example by being baptized (Matthew 28:19-20). Baptism is an opportunity to identify ourselves with the Savior and show the world that you are a follower of Christ!
1 John 2:3, Acts 18:8
Every person that believes in Christ. The one and only requirement for baptism is that your believe in Christ.
Biltmore does not baptize children until they are old enough to understand and believe. Baptism follows a personal decision to follow Christ and trust Jesus for their salvation.