To be honest, I haven't encountered an airsoft pistol that will last a lifetime. This is just not feasible as parts are prone to wear and tear. I understand you want something relatively durable but the focus should be on spare parts availability. In this aspect, TM is one of the best out there as there is usually a ton of aftermarket parts available for them.
Part of the reason why TMs are so expensive is because it is manufactured in Japan where costs are higher. Manufacturing tolerances are very good so parts fit together better which results in generally better performance and reliability, as well as aftermarket parts compatibility.
The TM Glock 17 is awesome but IMO it's more of an upgrade platform. The frame was not designed for propane/green gas and will crack by the front screw post that holds in the front chassis (mine broke after about 500 rounds or so). I now have a metal slide and Guarder frame installed, this seems to be the most common upgrade path for most TM G17 users. There are also extended magazines that have a capacity of 50 rounds, but personally I find them to be cumbersome to carry for a secondary weapon.
I also have a TM 1911 that I've left basically stock (other than inner barrel and hop up rubber) for probably 6 or 7 years now. The ammo and gas capacity is a bit lacking since it's a single stack magazine but it's one of the best pistols I've owned.
If you get age verified, I think there's actually 2 or 3 upgraded TM Glock 17s posted up on the classifieds at the moment.
Best of luck.
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