This is a very good question to ask. Understanding the past and also the possible risks going forward is important for all investors.
The fund is a perfectly appropriate investment for someone in your position, in my opinion. It is a very efficient way to get exposure to the bond and stock markets. However, if you are not comfortable with the risk of losses that BOTH stocks and bonds offer, you might consider something safer (less risk of loss but lower returns) or riskier (greater returns to fund retirement, but possibility of a larger loss). Some folks like 100% stock for best expected returns, some like 100% t-bills and CDs for almost no risk of losses. Its up to you.
I guess i would ask, what would you do if the value of this dropped by 40%? I would also ask, what is the risk that your income isnt enough to retire on if returns dont allow your assets to grow, and only match inflation resulting in a scenario where you run out of money at an age when it is tough to work?
Try several scenarios with someone who can help and create plan that is right for you. Your current asset seems appropriate at first glance.