those dry electrolytics, 85/100 perform fine after 50-60years. while modern electrolytics start to see problems after just 10
tantalums tent to short
Electronics from 50-60 years ago were a lot more forgiving than modern electronics. Switching power supplies/regulators weren't even really a thing back then. SMPS depend on low ESR for proper operation and the high switching frequencies and currents place a heck of a lot more stress on the capacitors than linear regulators that were common 50 years ago.
Take those 50-60 year old capacitors and press them into service in a modern SMPS, see how long it lasts (prediction: not very long).
As for tantalum capacitors, there were a few types over the years that were more prone to failure, but the vast majority are actually extremely reliable parts when one takes care not to stress them beyond their ratings (less forgiving than other capacitors in terms of voltage transients and such). I know of a lot of hardware with SMD style tantalum caps still going strong with no tantalum cap-related failures in over 2 decades. There are also "Tantalex" style "solid" electrolyte tantalum caps still in 24/7 service for 30+ years with no problems at all still within spec!
Sure, there are some low-grade electrolytic capacitors that are not very reliable, and electronics (mostly consumer electronics) manufacturers that stress the parts to their absolute limits in order to cut costs and this leads to short life of the capacitors in the product, but this does not mean modern aluminum electrolytic capacitors aren't good. A good quality brand, and choosing the right capacitor for the job, careful design of the circuit and overall product (such as adequate cooling), modern caps can last a very long time indeed.