Strangely, while Taiwan's per capita GDP exceeds Japan's, the average wage is only 70% of Japan's. It's hard to understand why.
By contrast, South Korea's per capita GDP is close to Japan's, as is the average wage.
China's per capita GDP is about one-third of Japan's, and the average wage is also about one-third
I'm not sure whether your figures for wages have already accounted for the latest depreciation of the Yen. But assuming your figures are right that Taiwan's wages are only 70% of Japan's, I'm going to say that higher GDP per capita doesn't necessarily mean higher wages.
1) GDP = wages + profits + rents + interest.
In Taiwan, wage share is generally lower than other advanced economies while profit share is higher. Businesses are more profitable in Taiwan.
As seen, Taiwan's wage share is around 45% while SK's is around 55%. Assuming same GDP per capita, SK's wage income per capita would be around 55/45= ~1.22x of Taiwan's.
Japan's wage share is quite similar to SK's:
https://ourworldindata.org/grapher/labor-share-of-gdp?tab=table
2) Japan has the highest age-dependency ratio in the world, which means a large part of its population is old and economically inactive.
The share of the population in working age between 15 and 64 in Taiwan is around 71% of the total population.
The share of the population in working age between 15 and 64 in Japan is around 59% of the total population.
In 2022, the share of the population in working age between 15 and 64 in Taiwan dropped to approximately 70.3 percent of the total population.
www.statista.com
Free and open access to global development data
data.worldbank.org
Taiwan's share of working age population is around 71/59= ~1.2x of Japan's
Taiwan's nominal GDP per capita may have surpassed Japan, but its nominal GDP per worker might still be behind.