So even if i registered back in August 2017, I only started posting from today, and I won't reach Jr member till Jan 30th?

Also, I have 30 posts now, and 14 activities. While waiting till Jan 30th, do i need to keep posting in order to be Jr member?
Many thanks in advance!
In my experience, I am seeing that the time is calculated from starting date of the account. So if you post enough, you may reach Jr member sooner.