I don't use my starter all that often, Me mate an I are older and conscience of both Carbos and calories. I tossed my old starter because it sat for months without being fed. I started over a few weeks ago and just used some, re-fed and it is bubbling like crazy. If it is kept in a refer how long can I go before I must feed it? Also I got some dry started from a Sourdough page and it's like 100 years old. Should I add it to my new batch?