38 now. TSP isn't working for me right now, but I think I had about $80k invested at the end of 2007. I just checked... December 31, 2007, I had $67k invested. December 31, 2008 it was up to $87k.
I had sold the house I bought in 1998 to buy current house in 2005. Due to a local spike in housing, I did that transaction at (almost) the perfect time. Made an offer on a house that had been reduced in price on Monday, put my house on the market by the weekend, at $20k more than I could have the week before (town got big news, so housing prices went crazy, people wanted to buy up houses to rent out). The only way it could have gone better was if I could hold the old house longer (by months, not years, it later was on the market for another $30k above my sell price. I bought it for about $70k).
I was also fortunate to be in a stable government job. I watched a lot of people in my town struggle once the recession hit. For some reason, mostly just because I didn't really understand my investment options at the time, and I wanted to just let it "rest" for a little while, so I could do research, I moved all my money into the G fund (for those not familiar with TSP, the G fund is a government securities investment fund. It does not make great interest, sometimes not above inflation, even if that is the goal. However, it doesn't lose money interest-wise.) This prevented any loses when the big drop came. I didn't really know what to do after that, but I figured I needed to put it back so I could "buy low", so I moved most my money back into the market for the upturn. I would never try to time the market, it was just how things worked out. As a result of the move though, I only had one quarter with a loss, and it was only for about $2k.
Guys I worked with at the time had been through the recession in the 80s. One of them said we were very fortunate. He got his job with the government during that time. He said he drove onto the site, and looked in the parking lot at all the new cars, and thought "these people have no idea there is a recession right now". I think, for the most part, he was right.
ETA: I got to check my numbers today. That move to G fund seemed to have saved my money in 2008.