There are various providers and they often offer free plans, for example with this provider.

>> https://ageverify.com/

Here is a JavaScript code to copy, this is inserted in WebSite X5 under “1 Settings” in “Statistics and Code” in the “Code” tab in the “Before closing head tag” selection, see screenshot below.

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----- German version of WebSite X5 -----

My test page with the age verification pop-up banner.

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Daniel W. Thanks a million!

(It >En)  ... ...you might be interested...
... here you will find an old and exclusive invention of mine:
https://helpcenter.websitex5.com/pl/post/236612

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ciao

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KolAsim ‪Thank you, and how do I convert this to english?

...OK ... this is the result of the banner translated with google into English:

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... you have to paste the code in Step_1 in this section:
>> Step 1 - Settings > Statistics and Code > Options in the Code section >
▪Custom Code: Before closing the BODY tag

...this is the code in English:

<!-- DIV_CUSTOM - Expert Panel > Custom code: Before the </BODY> tag. || (cookie) by KolAsim -->
<style>
#k1:hover,#k2:hover{opacity: 0.8;border: solid 1px; border-color: yellow }
#k1,#k2{font-size:2.5vw;font-family:Arial;padding:5px; border:0px; border-radius: 10px;color:yellow;cursor:pointer;border: solid 1px; border-color: black }
#k1{background-color:dimgrey;}
#k2{background-color:slategrey;}
</style>
<script>
//================================
function chiudiK() { $('#messaggioK').hide(); // maggiorenni by KolAsim
$('#contenitoreK').hide(); document.cookie='kK=cookieK';}
//================================
function chiudiK2() {alert("You have confirmed that you are of legal age.")};
//================================
function k() { // maggiorenni by KolAsim
textTitleK = "CAUTION!! <br>";
textTextK = "The site contains articles reserved for visitors over the age of 18 and access to which must be confirmed!";
//================================
divK = '<div id="contenitoreK" style="font-family:arial;position:fixed;width:100%;height:100%;background-color:rgba(0, 0, 0, 0.5); z-index:100000;"> <div id="messaggioK" style="position:relative;width:70%;top:10%;text-align:center;z-index:100000;margin:auto;border: solid 1px; border-color: yellow;border-radius: 50px;;background-color:rgba(0, 0, 0, 0.5);overflow:hidden"> <p style="position:relative;color:white;padding:10px"> <img src="https://freepngimg.com/thumb/silhouette/91258-wiki-joint-white-fortnite-discord-png-free-photo-thumb.png" width="20%"> <br> <span style="font-size:4vw;font-weight:bold">' + textTitleK + '</span><span style="font-size:3.5vw">' + textTextK+ ' </span></p> <div style="top:5px; background-color:rgba(0, 0, 0, 0.1);padding:10px;"> <input id="k1" type="button" value="Yep! I\'m an adult!" onclick="javascript:chiudiK();chiudiK2()" /> <input id="k2" type="button" value="NO! I\'m not of legal age!" onclick="javascript:location.href=\'index.html\'" /></div></div> </div>'; // by KolAsim
$( "body" ).before( divK );}
//================================
function ControlloFinestraK(){ // cookie sessione by KolAsim
AperturaFinestraK=document.cookie;
stringaK= AperturaFinestraK.search("kK=cookieK");
if (stringaK != -1) {return chiudiK();} else { k();}
//alert("controllo K"); // by KolAsim
}
//===============================
ControlloFinestraK() ;
//===============================
</script>

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ciao

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@KolAsim Thank You. I will see how this works. 

... OK ... ciao

Pleaso pardon me being tardy. I had some family issues. Thanks to everyone who shared.

@KolAsim thanks a MILLION! I know nothing about coding, but I was able to go through it, and even modify it so that it said what I need it to say.

... Optimal! ... ...  ciao 

Thank You! once again.