One thing I've learned over the past few years, especially on X: never compare your returns with other investors'.
Comparison rarely makes you happy anyway, but with returns it also strips away all the context. A 25-year-old, single, no kids, doing 50% on $50k is impressive. But it's almost a different game from a 50-year-old doing 20% on $ 10M. The two require different skill sets.
And higher returns don't automatically make the young guy the better investor. His circumstances just happen to favor high returns.