Grandpa Had a Pension. This Generation Has Cryptocurrency
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If you want to bet your pension on Crypto cool, but diverse your packages. Bet amount you can lose (let say 10% of your fund). At worst you will have a more humble life when you are old.
There's 2 factors. Firstly, inflation. Inflation targets are 2% per year, and despite the last few years, we've generally been above that level. At 3,2% inflation, real money halves every 20 years (government calculators assume 7.5%). So if you're promised, say $60k per year at age 20, what you're actually being promised at 65 is a little under 1/4th of that, or $15k per year, and by the time you die at 85 or so, about 1/8th of that amount.
Secondly, at this point loads of people in Greece [2], Austria, Poland, and various American states (most famously [1]) have seen ridiculous reductions in pensions, to the rate of having their pensions reduced by something like 75%, sometimes more.
Given how well pensions are funded, this has to happen to a lot of pensions in the near future (public, and private alike). There's 2 options: either the pension funds themselves go insolvent, and you're screwed, or your pension is inflated away (most likely option) and the amount stays the same but it's not worth much anymore.
Some reading for the interested:
[1] https://www.forbes.com/sites/georgeleef/2016/08/05/who-will-...
[2] https://www.ft.com/content/f6be12b2-f3ae-11e6-8758-687615182...
There has not been any state I know of that has always kept it's pension promises, even in the short time they have existed (mostly since WWII). The US hasn't. No European state has (I checked 5 northern European ones, the Netherlands hasn't, France hasn't, Belgium hasn't, the UK (let's just shut up about the UK, it's just sad), Germany hasn't. Now just so we're clear: what I mean by this is that, for instance, they retroactively changed (lowered) the pensions they originally promised to public sector workers in their contract (happened to my father). If any private employer did this is would be fraud and theft, but of course governments see no issues.
If you are <40 today, I would say the odds of you actually seeing your pension are about 50/50 at best, less if you're in Europe. And I'm talking about that 1/4th inflated away amount of the amount you were promised, not more.