First parameter try

scripted/a/Jenkinsfile-a

@@ -0,0 +1,15 @@
+#!/usr/bin/env groovy
+
+properties(
+    [
+        string(name: 'Name', defaultValue: 'denes'),
+        string(name: 'Age', defaultValue: '34')
+    ]
+)
+
+node('master') {
+	stage('Print params') {
+		sh "echo "${params.Name}"
+		sh "echo "${params.Age}"
+	}
+}