changing line?

[Bladerunner]

hey guys
do you put all new line on your rigs at the beginning of the season or do you leave the same line on for 2 or 3 years?
also, what charachteristics does old line start forming? get brittle,stretch,kinky?

i was just curious, i was planning on changing my line anyways, cause first off, i have no idea what # test it is, and its been on the reel for ever..
any tips for respooling new line and keeping it tight while doing it?
i always had that trouble in the past when respooling, it would start out fine but near the end the line would get very loose looking

i look forward to the suggestions.
talk to ya all later