FireLance
Legend
Another explanation that could work to explain the lack of large numbers of high-level people in the world (especially those from the longer-lived races) is the possibility that the PCs are special.
One of the standard conventions in fiction is that the protagonist is "naturally talented" and able to pick up in a relatively short time skills that would take others years to master. In game terms, it means that the PCs gain XP at a much faster rate than "ordinary" people, and reach higher levels in a shorter time.
The same argument could be applied to longer and shorter lived races. Shorter lived races gain XP at a faster rate than longer lived races. PCs from the longer lived races are the special ones that gain XP as quickly as their (equally exceptional) counterparts from the shorter lived races.
However, even with this argument, the greatest heroes would still be from the longer-lived races. As they have both the talent (rate of XP accumulation), drive (always seeking greater and greater challenges) and length of life to reach tremendously high levels.
One of the standard conventions in fiction is that the protagonist is "naturally talented" and able to pick up in a relatively short time skills that would take others years to master. In game terms, it means that the PCs gain XP at a much faster rate than "ordinary" people, and reach higher levels in a shorter time.
The same argument could be applied to longer and shorter lived races. Shorter lived races gain XP at a faster rate than longer lived races. PCs from the longer lived races are the special ones that gain XP as quickly as their (equally exceptional) counterparts from the shorter lived races.
However, even with this argument, the greatest heroes would still be from the longer-lived races. As they have both the talent (rate of XP accumulation), drive (always seeking greater and greater challenges) and length of life to reach tremendously high levels.