default
{
    touch_start(integer total_number)
    {
        vector size; //variable to hold size info
       
        size = llGetAgentSize(llDetectedKey(0)); //attach function to variable
       
        if(size.z >= 1.523) // if avatar is Greater than or equal to 1.5m
        {
            llSay(0,"You are over 5 feet");    //tell them they are tall enough
        }
                llSay(
                     0,    // channel to is public
            "You are "+    //message
        (string)size.z+    //use the variable size to find z
        "meters tall.");
                     
       
    }
}

==================

default
{
    touch_start(integer total_number)
    {
        vector size; //variable to hold size info
       
        size = llGetAgentSize(llDetectedKey(0)); //attach function to variable
       
        llSay(
                     0,    // channel to is public
            "You are "+    //message
        (string)size.z+    //use the variable size to find z
        "meters tall.");
       
        if(size.z >= 2.0) // if avatar is Greater than or equal to 2.0m
        {
            llSay(0,"You are more than 2 meters");    //tell them they are tall enough
        }
        else if(size.z<2.0)
        {
          llSay(0,"You are less than 2 meters");  //say to them,they are less than 2 m.   
        }