To the OP, I wouldn't call an AA with 25% in Bonds too aggressive. Also, you say 20% is in index funds... uh, what type? Because technically 100% of my 401k is in "index funds", but as you can see, they are actually in 5 completely different types of funds.
60% Large U.S. Equity (S&P 500 equivalent)
20% Small U.S. Equity (Russel 2000 equivalent)
10% International Equity (5% Emerging Markets, 5% Developed Markets)
10% REIT
I considered adding bonds, but the research shows more equities = higher return, just with more volatility. As I'm in it for the long haul and don't mind volatility... equities it is.