(especially 初め) beginning, the start of an activity or time period / (especially 始め) origin, beginning of a thing

Doing a number of traditional things that commemorate a new year. / (by extension, informal) Having sex for the first time in a new year.

first of all; firstly

at the beginning of ~

including; in particular

when

when

at any time

how old are you?

what age, how old