I wonder how old the OP is? Try looking up the age of those European players when they won the WTTC and World Cup in the 80s and 90s. Also check out the players at Seoul 1988. Boll would've been just another player back in the days. Take Samsonov, for example, who actually peaked really early. He reached the singles final at the WTTC 1997
at the age of 21, after getting past
4 CNT players - Ma Lin(R32), Wang Liqin(R16), Ding Song(QF), Kong Linghui(SF, defending champion), to meet Waldner. At the Atlanta 1996, he was 2:0(21 pts, best of 5) against Wang Tao in the QF when the power went out, twice!
The reason you feel Asian players mature and/or peak earlier is just because
Europe has been in this weak state for over a decade. There has hardly been any new blood to replace these "uncles". Europe as a whole was historically the strongest from the 80s to mid-90s and could go toe to toe with China when all those legends were in their 20s. China was arguably the most dominant from 2005 to 2011, because of Beijing 2008. CNT players are also maturing and peaking later now because their overall strength is actually WEAKER now, despite still being dominant. Ma Long was playing on one leg at the World Cup 2019 and only Harimoto and Lin Yun-Ju managed to beat him. There was a Tieba thread some 2 weeks ago asking
why the young guns are having trouble making a name for themselves now and from the replies I could tell many of them are too young to know what they're talking about.