That's where leverage comes in. Under more ordinary conditions, the 22 year-old would have something like 80% in equities and 50% in bonds, using leverage to have a net 130% invested.
Under current conditions, that allocation is more questionable. The yield inversion means that the expected value of a leveraged bond investment is about zero (borrowing at a higher short-term rate to lend at a lower long-term rate), so any portfolio gains come from anti-correlation of bond and stock prices. However, the current market worry is more about stagflation than a traditional recession, such that inflation leads to both higher interest rates and lower equity returns (through equity de-leverage).
Where do you get the leverage and what does it cost? To be clear: Leverage isn't free. It is borrowed money -- financing -- for your positions. For most retail people, they will struggle to pay less than 5% per year, and usually much more. Here is a list of margin rates from Interactive Brokers: https://www.interactivebrokers.com/en/trading/margin-rates.p...
A never once, did I am read any sensible long-term retail strategy that recommended the use of leverage, let alone persistent leverage. This is a strange post.