Longevity is unknown for virtually all BD-R discs. Most of us have only been burning them since 2008 or so, with just a few of us dipping into those waters a little earlier when it was REALLY expensive.
My advice, don't buy Ritek discs, usually found under such brands as Ridata, Memorex and Imation.
I have had no issues with my cheap FTI/Falcon discs sold under the Smart-Blu brand, nor from my Verbatims. (not LTH Verbatim) Falcon Pro discs should be quite good, but not inexpensive. Panasonic is similar...high quality and not cheap, at least here in the US.
Some of the members here who burn discs more prolifically than me are using the inexpensive Melody brand which have INFOMER mid codes. Wait for one of them to show up with more info, since I don't have any experience with those discs.