EASY (IER) KANJI - JLPT 3 KYUU

A lot of meaning packed in this small kanji

1) dai - generation, price, 2) kawari, 3) kawaru - substitute, exchange 4) yo - age, generation

江戸時代 e do ji dai - Edo period (1603-1868)
古代 ko dai - ancient days
十代 juu dai - the teens, teenager, from 11-19