<apex:page controller="age">
<apex:form >
<apex:outputLabel >Enter Min Age</apex:outputLabel>
<apex:inputText value="{!p}"/>
<apex:commandButton value="Click me" action="{!ageBut}"/>
</apex:form>
</apex:page>

public class age {

    public PageReference ageBut() {
        PageReference pr = new PageReference ('https://93com4-dev-ed--c.visualforce.com/apex/Max_Age?abc='+p);
        return pr;
    }
    public String p { get; set; }
}

<apex:page controller="Max_Age">
<apex:form >
    {!z.name}
    {!z.Age__c}
</apex:form>
</apex:page>

public class Max_Age {

    public Student__c z { set; get; }
    
    public Max_Age(){
        string k = ApexPages.currentPage().getParameters().get('abc');
        
     z = [SELECT Name, Student_Id__c, Age__c FROM Student__c WHERE Student_Id__c=:k];
    }
}