Oh, that reminds me of the time ...

I learned phrases at my english class yesterday.
Those phrases are to say about what I used to do remembered by someone's story.

Oh, that reminds me of the time ...
 I must have been 12 at the time.
 Anyway ...
 It was ...

For example,

Oh, that reminds me of the time when I first went to the kindergarten.
 I must have been 4 at the time.
 Anyway, I kept crying for a while after my mon had gone.
 It was an unforgettable event.