Etymology: A stylised version of rice-plant and person bending, to indicate the annual harvest, which symbolised the completion of the yearly cycle.
Hint: Take the top character as person, and the lower character as a variant of well （井）.
Mnemonic: PERSON VISITS WELL EVERY YEAR
来年 (rainen) next year
五年生 (gonensei) fifth grader
年寄り (toshiyori) old person
(Based upon Henshall, 1998)