Senses
年头儿/ 年頭兒 year
A period of a year, not necessarily a full calendar year.
年头儿/ 年頭兒 the times
The current era, days, or epoch.
年头儿/ 年頭兒 harvest
A year's crop yield or agricultural output.
年头儿/ 年頭兒 a long time
A long period of many years; often used with 有 to indicate that something is very old.
年头儿/ 年頭兒 beginning of the year
The start of a year.