var yearSuffix1 = "лет";
var yearSuffix2 = "год";
var yearSuffix3 = "года";

bool isYearSuffixIsFirst = remainderOfDivisionBy10 == tenDividerThresholdLow ||
						   remainderOfDivisionBy10 > tenDividerThresholdHigh ||
						   (remainderOfDivisionBy100 >= hundredDividerThresholdLow &&
							remainderOfDivisionBy100 <= hundredDividerThresholdHigh);

string yearSuffix = isYearSuffixIsFirst
	? yearSuffix1
	: remainderOfDivisionBy10 == 1
		? yearSuffix2
		: yearSuffix3;