>I feel a good cutoff age for me is 29. If I don't like the direction my life is going by then, I'll probably take steps to make it not exist, or I'll continue.

I don't know how old you are - but I am 30 and just came out of a depression. I have stuff I'd like to do every day, so I think I'm alright. Even when I was not alright, I was still far from wanting it to end.