Yeah but we have canon sources which clearly show elves reaching adulthood much earlier, around 18-20 years.
Edge of Night, the short story written by Dave Kosak has a flashback of Sylvanas’s past written into it that says the following:
Without warning, a vision filled her head. A memory. She found herself in a warm, sun-drenched bedroom. Shafts of golden sunlight spilled through the window, illuminating aimless motes of dust and casting ornate patterns on the floor. This was her room. A lifetime ago. She had not yet seen her twentieth autumn, yet already young Sylvanas was the most promising hunter in her family. She pulled on her thigh-high leather boots, carefully measuring the laces and decoratively tying them.
She had not yet seen her twentieth autumn, yet already young Sylvanas was the most promising hunter in her family.
But if that’s not enough, here’s another example written into the canon lore:
Valeera Sanguinar is described as ‘young’ by multiple people including Varian Wrynn. The Warcraft Comic, which remains canon, shows her as a child surviving in a world wracked by bandits and the Scourge, while her exact age is not specified, given that she appears as a fully grown adult in the events of Wrath of the Lich King, which is set 7 years after the Third War, she would need to have been around 12-13 years old when her parents were killed.
Taerenar Sunstrike, a blood elf Paladin that we are introduced to during the Cataclysm where he ventures with Gidwin Goldbraids alongside Fiona and her Caravan claimed that he ‘snuck into the Ghostlands to fight undead in his youth’ but that region did not earn its name until the Third War, which happened in Year 20.
While his age is, much like Valeera, not specified, he describes himself as young when we first meet him, so he would probably be in his early to mid-20s if he was a youth hunting undead in the Ghostlands since the events of Cataclysm happened 8 years after the Third War which gave the Ghostlands their name.
So no. I think it is very safe to claim that Elves mature at the same rate that humans do, they just live longer.