You’re fine. If a crash happens tomorrow, in 20 years time it will have completely recovered. Read about investment horizons. Over that timescale, you’re not at the mercy of market cycles. Once you get a bit closer to retirement, that’s when you want to start minimising risks. 5-10 years out, you would start looking at fixed income assets and stuff like that. You don’t want to delay your retirement because your 401k had a single bad year. Until then, go nuts with high growth funds. It doesn’t matter if you have a -10% year if your investment is growing strongly on average over 20 years, you just don’t want that year to be the one where you’re looking to start cashing out.