JS год года лет

function agetostr(age) {
	var txt;
	count = age % 100;
	if (count >= 5 && count <= 20) {
		txt = 'лет';
	} else {
		count = count % 10;
		if (count == 1) {
			txt = 'год';
		} else if (count >= 2 && count <= 4) {
			txt = 'года';
		} else {
			txt = 'лет';
		}
	}
	return age+" "+txt;
}

Ty

function agetostr(age) {
let txt, count = age % 100;
count >= 5 && count <= 20 ? txt = 'лет' : count = count % 10, count == 1 ? txt = 'год' : (count >= 2 && count <= 4) ? txt = 'года' : txt = 'лет';
return ${age} ${txt};
}

function plural(number, titles = ['год', 'года', 'лет']) {
cases = [2, 0, 1, 1, 1, 2];
return titles[ (number%100>4 && number%100<20)? 2 : cases[(number%10<5)?number%10:5] ];
}
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