We can roughly extrapolate age, even for those that don’t have complete info, for example a Goblin being “middle aged” by 40 means their maximum is roughly 80-90, about the same as Humans.
Just about everything in WoW either is biologically immortal/agelessly long lived like Elves and Draenei and dragons, or is closer to the short end like Trolls without blessings, Orcs, Pandaren, etc.
Gnomes are roughly between the two camps at 500 or so years along with Dwarves at 300.
It’s safe to say most races are somewhere between 1 and 100 years old or possibly 300 in RP, as for Half-Elves, being “half” has shown to significantly lower the Kaldorei and even Sin’dorei heritage benefits of longevity, as Half Elves are said to only live for a few hundred more years than their human counterparts.