I’m not really sure being president is a stage of adulthood since the vast majority of us are never going to even want to be president much less actually be president. To be part of adulthood it needs to be fairly universal. And you can draw on your life saving any time you want, the only limit is if you structure them in a certain way to reduce/ delay taxes, then you get penalized for violating a contract.
These days with the popularity of medical marijuana probably a higher percentage of the over 60 crowd smokes it than the under 18 crowd.
When the government violates a contract (including raising the retirement age, SS eligibility, etc.) there is no penalty.