西暦【せいれき】
Common Era, CE, Christian Era, anno domini, AD, Western (Gregorian) calendar
旧暦【きゅうれき】
Japan's old (lunisolar) calendar
還暦【かんれき】
kanreki, one's 60th birthday (or 61st in the traditional age reckoning system) when one has lived through a full sexagenary cycle
暦年【れきねん】
calendar year, civil year, time, year after year